For the English writers / speakers on this list.
The newest databases on www.ancestry.com (or it's various international versions) are not immediately added to the overall collections like Births, Marriages, Deaths or Census, etc., nor to the various state or country collections like New York or Germany.
To see the newest databases before they are added to their appropriate collections on ancestry do the following.
Note: this works for the USA and Canada version. I'm pretty sure but not positive it is very similar for the other international versions of ancestry.
From the ancestry.com homepage click on the Search tab at the top of the page.
On the search page, scroll down to near the bottom of the page. At the bottom of the column on the right side of the page click on "recent website additions"
You will then be taken to the page listing the newest databases that have been added or updated.
Under the posted date of 12/7/2009 you will see " Mecklenburg, Germany, Parish Register Transcripts, 1876-1918 (in German)." Click on that listing and you are at the database. Below the search form you will see a list of the parishes included in the database. Some of the parishes in this database actually include church records earlier than 1876.
Of course to use the database you need to subscribe to the world subscription or be at a library that has the library edition of ancestry.
This "Recent Website Additions" page is updated every time ancestry adds or updates a database on its site.
ALSO
For those with Mecklenburg ancestors, if you know the village but not the parish go to the following website of the Mecklenburg Genealogy Group and click on the "Locations" button. Then type in the name of your village and it will give you a list of matches that tell you the location of the village's parish. It will even give you a basic overview of where the village is on a map. This locations are only for Mecklenburg-Schwerin or Mecklenburg-Strelitz not all of Germany. This is a German site but it has several English pages. Of course, if may get multiple hits for your village name you will still need to figure out which village is the one you seek.
http://mfp.math.uni-rostock.de/
Hope this helps. Sorry for not writing this in German also but it's getting late and I'm tired.
Lisa