The Cumulative update package 1 for SQL Server 2008 Service Pack 2 (Build 10.00.4266.00) is available:
http://support.microsoft.com/kb/2289254/
And here you can get the whole information of builds that were released after SQL Server 2008 Service Pack 2 was released:
http://support.microsoft.com/kb/2402659/
CU
tosc