The Cumulative update package 8 for SQL Server 2008 Service Pack 1 (Build 10.00.2775) is available:

http://support.microsoft.com/kb/981702/

And here you can get the whole information of builds that were released after SQL Server 2008 Service Pack 1 was released:

http://support.microsoft.com/kb/970365/en-us

CU
tosc