SQL Server Version

SQL Server 2008 R2
10.5.1720.0 SQL Server 2008 R2 CU2 25 June 2010
10.5.1702.0 SQL Server 2008 R2 CU1 18 May 2010
10.5.1600.1 SQL Server 2008 R2 RTM 12 Apr 201

Bill Graziano at SQLTeam.com has a listing of all the SQL Server versions that come in very handy:

http://www.sqlteam.com/article/sql-server-versions