For SQL 2000, there was actually a Security Vulnerability published in April and republished in August. MS12-060. Microsoft released hotfix version 8.00.2305. If you are going to patch your SQL 2000 SP4 servers, I would put this one on.

We have over 1000 SQL servers installed with a mix of SQL 2000, 2005, 2008, 2008 R2, and 2012.

This is my favorite site for tracking the latest SQL versions:

http://sqlserverbuilds.blogspot.com/

They do a pretty good job of keeping this list up to date - and they provide links directly to the download for each version.