Update 27-Oct-2011
Found more recent build information on SQLSecurity.com and sqlserverbuilds.blogspot.com.
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Found this helpful information regarding SQL Server versions and service packs from Bill Graziano on SQLTeam.com. Posting the SQL Server 2008 R2 information for my future reference, however Bill lists this and prior SQL server versions as well.
| SQL Server 2008 R2 | ||
| 10.50.1765.0 | SQL Server 2008 R2 CU6 | 21 Feb 2011 |
| 10.50.1753.0 | SQL Server 2008 R2 CU5 | 20 Dec 2010 |
| 10.50.1746.0 | SQL Server 2008 R2 CU4 | 18 Oct 2010 |
| 10.50.1734.0 | SQL Server 2008 R2 CU3 | 17 Aug 2010 |
| 10.50.1720.0 | SQL Server 2008 R2 CU2 | 25 Jun 2010 |
| 10.50.1702.0 | SQL Server 2008 R2 CU1 | 18 May 2010 |
| 10.50.1600.1 | SQL Server 2008 R2 RTM | 12 Apr 2010 |
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