I thought I might pass on this information. It might be helpful to a lot of people.
The Archiv Srem- in Sremska Mitrovica has put online a Mircosoft Excel showing it's holdings. The file is in Serbian, but it is extremely helpful. The file breaks down all the records by locality. I am been able to verify that many of the records I have been searching for are in this archive.
I have not checked if the other regional archives are creating similiar files. (Srem is the only area I am personally working in at this time).
The fonds include civil, church and school records. Access is still and issue, but at least these records exist.
FYI this is a very large file...www.arhivsrem.org.yu/site/?page_id=11