Cumulative update package 10 for SQL Server 2005 Service Pack 2 (Build 9.00.3294) is now available:

http://support.microsoft.com/kb/956854

And here you can get the whole information of builds that were released after SQL Server 2005 Service Pack 2:

http://support.microsoft.com/kb/937137/en-us

Take also a look at this:
Microsoft SQL Server 2005 Service Pack 3 Beta now available

CU tosc