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