Microsoft has released SQL Server 2008 SP2 Cumulative Update 3, which is Build 10.00.4279.00. I count 25 fixes listed in the Knowledge Base article for the Cumulative Update.

Here is the SQL Server 2008 CU Build Matrix:

-- SQL Server 2008 RTM is considered an "unsupported service pack" as of April 13, 2010
-- SQL Server 2008 RTM Builds   SQL Server 2008 SP1 Builds     SQL Server 2008 SP2 Builds
-- Build       Description      Build       Description         Build     Description
-- 1600        Gold RTM
-- 1763        RTM CU1
-- 1779        RTM CU2
-- 1787        RTM CU3    -->    2531        SP1 RTM
-- 1798        RTM CU4    -->    2710        SP1 CU1
-- 1806        RTM CU5    -->    2714        SP1 CU2
-- 1812        RTM CU6    -->    2723        SP1 CU3
-- 1818        RTM CU7    -->    2734        SP1 CU4
-- 1823        RTM CU8    -->    2746        SP1 CU5
-- 1828        RTM CU9    -->    2757        SP1 CU6
-- 1835        RTM CU10   -->    2766        SP1 CU7
-- RTM Branch Retired     -->    2775        SP1 CU8        -->  4000       SP2 RTM
--                               2789        SP1 CU9
--                               2799        SP1 CU10
--                               2804        SP1 CU11       -->  4266       SP2 CU1
--                               2808        SP1 CU12       -->  4272       SP2 CU2
--                               2816        SP3 CU13       -->  4279       SP2 CU3