Today Microsoft has released cumulative updates for both SQL Server 2008 SP1 and SQL Server 2008 SP2.
SQL Server 2008 Service Pack 1
KB #2527187 : Cumulative Update #14 for SQL Server 2008 Service Pack 1
There are 10 fixes listed for this update, and the build # is 10.00.2821.
SQL Server 2008 Service Pack 2
KB #2527180 : Cumulative Update #4 for SQL Server 2008 Service Pack 2
There are 21 fixes listed for this update, and the build # is 10.00.4285.
To be thorough, these updates do not apply to SQL Server 2008 R2.
Dan, I can see the x64 builds just fine. Are you accessing from an x86 machine? Is there a link to show all platforms? The files you're looking for are:
SQLServer2008_SP1_CU14_2527187_10_00_2821_x64
SQLServer2008_SP2_CU4_2527180_10_00_4285_X64
There doesn't appear to be an x64 version when trying to download from the hotfix link, only x86.