There are ten searchable databases (encompassing twelve cemeteries) that have been created to this point for cemeteries in the New York-New Jersey metro area. I know of no plans to create other such databases. Since I wish that each and every one of you have the greatest success when searching these databases, I have written below my suggestions of how to best use them.
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The first searchable database was created  for Mt. Moriah Cemetery in Fairview, New Jersey. Their site can be found at www.mountmoriahcemeteryofnewjersey.org. Then the creation of a series of six databases began: Mt. Hebron Cemetery (www.mounthebroncemetery.com) in Flushing, New York, then Mt. Carmel Cemetery (www.mountcarmelcemetery.com) in Ridgewood, New York, Mt. Zion Cemetery (www.mountzioncemetery.com), and then one for Mt. Ararat Cemetery in Lindenhurst, New York (www.mountararatcemetery.com). Then one was created for Mt. Judah Cemetery in Ridgewood, New York (www.mountjudah.com.) The latest database created was for Mt. Lebanon Cemetery (www.mountlebanoncemetery.com), located in Glendale, New York. The database of Mt. Carmel increased in 2007 when they took over the management of the nearby Hungarian Union Field Cemetery. Mt. Carmel Cemetery has also taken over management of nearby Knollwood Park Cemetery, and you can now find burial data for Hungarian Field (Mt. Carmel's Section 4) and Knollwood Park (Mt. Carmel's Section 5) within their searchable databases. Realize that many of the Knollwood Park records do not have the correct date of death; the default death date of 1-1-1901 appears on many burial records.

Riverside Cemetery in Saddle Brook, New Jersey also has a searchable database which can be found at http://riversidecemetery.org . Just click on the link in the left column for "Genealogy Search" to begin.

The organization that runs (Old) Montefiore Cemetery in Springfield Gardens, Queens, New York and New Montefiore Cemetery in Pinelawn, Suffolk, New York also has created searchable database for each of these two cemeteries. You can find both by clicking on the appropriate link at www.montefiores.com. There are approximately 250,000 burials within both cemeteries combined.


MT. JUDAH CEMETERY

Mt. Judah Cemetery was organized in 1908, though its first burial was in 1912. There are approximately 54,000 people buried there, with the peak years for burials being 1918 and 1943 (more than nine-hundred each year.) Nowadays, less than two-hundred burials are conducted there each year. More on Mt. Judah Cemetery, including the contact information, can be found on the museum's Cemetery Directory page at www.museumoffamilyhistory.com/cp-directory.htm .
Below are some informative and hopefully helpful hints for you that hopefully will enable you to make best use of their new searchable database. Please remember that there may be errors in this database, and these of course that will be addressed and corrected as they are discovered. Since the information entered into this new searchable database was taken from the cemetery's own computer, it is possible that some data might be incorrect. The data that has been entered into the cemetery books and computer was done over the past ninety-five years without the foresight that a searchable database would be created, so obviously there will be missing data, spelling errors, etc.
1. In the Mt. Judah database, the date of burial is listed. Over the years, many burial transmit permits that arrived at the cemetery, especially those from out-of-state, had no dates of death listed, just date of burial, so many cemeteries, such as Mt. Judah, only list dates of burial as they often have no way of knowing when someone passed away, but obviously do know when they were buried.
2. There are approx. five-hundred "reserved" graves, i.e. they're made up mostly of graves that have been reserved though the person is not yet deceased. For example, one spouse might pass away, a double stone is erected with the name of the deceased spouse listed, the other part of the stone left blank, or perhaps all the info, such as name of the deceased, the Hebrew name of the person and their father, etc.,  is already inscribed except for the date of death. Because this is so, they will both be listed in the cemetery computer (and thus also the searchable cemetery database.) This is also true of some single burials/stones where the individual plot is reserved, the stone has or hasn't been erected yet, where the person has not yet passed away. Such entries will appear on the searchable cemetery database if you happen to be searching for one of these "reserved graves," and there will obviously not be a date of burial listed.
3. You should not find any entries where the date of burial is earlier than 1912. People that have been disinterred from another cemetery and reinterred in Mt. Judah will be found under the new date of burial, i.e. the date of reinterment, not the original date of burial or death. This is probably not the case with other cemeteries where they list the date of death, so that a cemetery whose  first burial was in 1915, e.g., might have a burial appear on their cemetery database whose date of death is 1898, and this 1898 will show up as the date of death upon searching the cemetery database. Mt. Zion lists dates of burial, Mts. Ararat, Hebron and Carmel list dates of death.
4. Where you see no society name listed for an burial entry, it probably means that the burial is in a private plot.
5. Mt. Judah has recently stenciled block and gate numbers on all their society gates; where no gates are present, stenciled numbers appear on small, wooden posts. This is true for all locations within the cemetery except for the "front" section that contains private plots. As these gate numbers are a new feature, they will not be found when searching the www.jgsny.org database, but one can still find the block number and section number (either 1 or 2) there. Mt. Judah has created a nice new map where the block and gate numbers are indicated, so armed with the burial information obtained through your individual searching of the cemetery database, and an overall grounds map (print it from their website or from my own cemetery map section or obtained in the cemetery office), finding an individual plot will be that much easier.
6. The search results are listed alphabetically, first by surname and then by given name.
7. If you plan on using the "Society" field to aid you in your search, please look up the society name as it is listed on the cemetery website. Click on the "About Us" link at the top of their home page, then the link lower down on the page that says "Click here to view a list of societies at Mount Judah." Use at least the first four or five letters of the beginning of the society name when searching by "Society." Realize that society names can vary widely, e.g. you may think the society is the "Czestochowa ...," but it can only be searched on the cemetery database as "Chenstochauer." You could just enter the letters "chens," and that would be enough. Also, using the JGSNY database (listed above) might reveal a society name that is not spelled the way that the cemetery has listed it as, so it is best to double-check the spelling on the cemetery society list before proceeding.


MT. ZION CEMETERY

I will discussing here the database created for Mt. Zion Cemetery in Maspeth, Queens, New York. Realize that changes need to be made to this database concerning content, fields, etc. I imagine that all three cemeteries will be working on their websites and databases (dbs) for quite some time to get them just the way they want them, so we must all be patient and give them time to make corrections, update their dbs, make all the changes and additions that need be made, and in general, improve their sites. If you find spelling errors in a name that appears on their db, they will not make any given name or surname changes in their db unless a death certificate is presented with the spelling that you want it changed to.

Of course, we should also be thankful that these searchable databases were created in the first place. My feeling is that it was more important to get all five searchable databases up and running first, and then going back and tweaking each afterwards--this certainly makes sense. The last two searchable dbs to be created in this grouping should be for Mts. Ararat and Judah Cemeteries, hopefully within the next few months. Realize too that I did not create these databases, and am only trying to facilitate your searches. I know of no other cemetery in the New York-New Jersey metro area that is creating a similar searchable database, but this is not to say that it isn’t/will not happen.

As the Mount Zion database (henceforth to be referred to as the MZDB) continues to be updated and improved, my suggestions might be more or less useful to you, but as it stands now here it is:
Searching for a particular person:
1. Obviously if you have a given name and surname that match what is in their db, this is the best.
If this is not the case, then you can:
Search only by surname.
Search only by given name.
Search by using the first letter of the given name and the full surname.
Search by using the first letter of the given name and the first letter or two of the surname.
If you are absolutely sure of the year of death you might want to enter that into the appropriate field box to further narrow down your search. Please note that the dates listed in the db are actually dates of burial, not dates of death (the cemetery knows about the discrepancy in the field name that appears on their database but cannot change it themselves, only the db creator can and he will hopefully do it at some point in the future.) Also please note that there are many entries listed in the db incorrectly list the date of death (burial) as being the first of the month. This is because these dates were entered incompletely without the correct day of burial. The default setting automatically issues the number 1 for day if no day is entered manually. This should also be corrected over time.

Example 1:
You had a great uncle whom you knew as Julius YUROWITZ, and you know he is buried at Mt. Zion in a Lasker (Lask, Poland) landsmanshaft plot (there is only one Lask plot at Mt. Zion). You were told that he passed away sometime after World War I but don't know the exact year.
Here is a logical way to proceed:
--look under Julius Yurowitz. Not there, what to do next?
--look under Yurowitz only. There are two Yurowitzs listed for this plot but no one named Julius (just a Jacob and a Rebecca). Jacob can't be the one you're looking for because he passed away in 1947. What do you do next?
--look only under J for Julius and Y for Yurowitz. In this case, if you also enter the keyword "Lasker" in the Society field, your search would be narrowed to two names as before (note that without the addition of the Society keyword you would have fifty-eight entries to chose from). Here, the names that are now displayed are the same Jacob Yurowitz and also a Joseph Yurintz. If you know the approximate year of death you would chose Joseph and assume that Julius was also known as Joseph, and that somewhere along the line his surname was spelled wrong and was entered as such into the MZDB. If you had no idea of the year of death before you started your search, you would think the person you were looking for was Jacob. If you didn't know what society plot he was buried in, you would have to have been a bit more creative in your search and go through more names until you found the one you were looking for.

2. So you see that you can search by various combinations of information. A good piece of advice for those hard to find entries, is try to do as broad a search as you can. For now, ignore the Block field they provide. From what I can tell, it is useless for the time being. If you decide to search only by path number, you will get all the names for all the society plots having that path number. There could be twenty society plots for that particular path number (the gate number that you might find on www.jgsny.org is useless for the time being when searching for information on the MZDB.) The Map/Path field is not only searchable by path number but by map number too, i.e. the number that corresponds to the particular society’s plot map that the cemetery has in their office. Unfortunately, most of us don’t know this map number (there's no website, etc. that has these numbers), unless you happen to notice it while doing a search for someone else buried in that particular society plot.

3. Remarks about the location field entries that are listed with most all of the search results:
Please note that many burial entries in the current version of the Mt. Zion db have no map number or path number attached to them. Many have no grave number either. The order to the numbers/letters that usually appear in the location field is (assuming that all four of these numbers have been entered into the db): block number/map number/path number/grave number. Ignore the “000” that is attached to many of the entries. Then the next is the map number. Realize that there are some entries that have nothing listed where the location should be, some may have one or more of these numbers and many only have the path number listed as their location. There are over 14,000 entries that just have the letter ‘N’ listed as the location (perhaps this means that there was no location listed for the particular burial other than the society name.)

Example 2: The Independent American Lasker Association plot again, officially path number A13L (there is only one Lasker plot at Mt. Zion Cemetery.)
If you decide to just search using the keyword "Lasker" in the society name field, you will find that there are 276 burials listed. If you search using the word "Lasker" and also include the correct path number A13L, only 260 entries appear.
Here is an example of the variations in how the individual plot locations are listed for each burial--168 of the 276 entries have the correct path number A13L, with no map or grave number listed in the location field, i.e. just the correct path number. Fifty-six have the map number with the correct path number and grave number. Thirty-one have the 000 (lot number), map number, A13L plus the grave number. There are other variations in lesser amounts, some with the path number listed just as AL (two also just with the letter N). Thus, if you just search by path number or map number alone you may miss what you’re looking for. Ideally, if you don't have the exact given name and surname as it appears on the cemetery's database and you know what the society name is (really the key word or words that are need in the Society Name field), you should be able to find the name you're looking for, even if you have to go through hundreds of names. This is not so bad as it seems, as the search results are listed alphabetical and you can at least skip to the first letter of the surname if you know what letter the surname begins with.

4. Note about the two hundred-entry limit and how to search only by society name:
Unlike the dbs at Mts. Hebron and Carmel, these burial entries are displayed alphabetically. If, let’s say, you search just by society and the surname for the 200^th (or 190^th, etc.) begins with the letter “S,” you know that the list you are looking at displays all the burials in that plot(s) from A to R. Knowing this, you can then search by society name along with each individual letter from S to Z  in separate searches. Note that there aren't any surnames beginning with the letter X in the db.

5. Note that the society names (the link to the list of the names of the society plots at Mt. Zion is at the bottom of their “About Us” page) will not necessarily be the ones that will work if you use them in the Society Name field when you want to conduct a search (unlike the dbs at Mts. Hebron and Carmel.) Somehow you will have to find out what name will work, either by trial and error or by finding similar entries using that particular path number, and copying and pasting the society name into the society name field during your own search. Generally speaking, the keyword, at least for the societies that are associated with towns, is the word that represents the town on their society names list, e.g. for Bransk, the keyword for the society named "Brainsker Bros Aid" is "Brainsker." Often (but not always) if there are more than one society plot associated with a particular location in Europe, e.g. Warszawa, they are labeled as Warschauer-1, Warschauer-2, etc., in order to distinguish one plot from another, even though the society names are different. Six of the seven Warszawa plots are this way (two plots are labeled Warschauer-6!).

6. There are also many mistakes in the db per the spellings of various given names and surnames. This occurs somewhere along the chain from the death certificate to the transit permit (the paper that accompanies the body to the cemetery before burial), to the inputting of the information onto the cemetery computer, to the inputting of the information onto their searchable db. The name spelling might not be what you think it should be because it was either given incorrectly at the beginning perhaps in a moment of grief, or by someone who didn't know the correct spelling, or it was heard incorrectly when they gave the spelling of the name. Perhaps the name was written on a document in a manner that made it a bit difficult to read or was written incorrectly to begin with, or could have been inputted incorrectly at the cemetery office. There are more possibilities of course.

Here are just a few examples of variations in surname spelling from just one society plot. Obviously, there are also mistakes/discrepancies with the given names too, but they won't be gone into here. Sometimes, there are discrepancies in both the given name and surname of the same individual. The first grouping illustrates that sometimes the cemetery db has the wrong surname spelling, but sometimes the spelling is wrong on the gravestone too.
The first surname for each entry below is what appears in the MZDB; the second is what appears on the gravestone. For the first grouping I have put in bold print the name that appears in the death index on www.italiangen.org, which should reflect what is on the original death certificate (unless that was inputted wrong too!)
Look for the patterns of misspellings. You will find obvious typographical errors in the lists below. There are a lot of homophones (here, surnames that have the same sound but are spelled differently.) Sometimes there is an extra letter, e.g. FLANNEL, the correct spelling being FLANEL; sometimes a letter is missing, e.g. COHN vs. COHEN. Sometime a letter is doubled when it should be single or two letters are reversed. Sometimes a vowel is incorrect or a "soft" letter, e.g. "C" is replaced with a "K" or vice versa. This can be a real mind twister!