Microsoft has released Cumulative Update 9 for SQL Server 2008 R2 RTM, which is Build 10.50.1804.0. I count 26 fixes in this Cumulative Update, which is for the RTM branch of SQL Server 2008 R2. Remember, this is completely separate from SQL Server 2008 SP2, which is the previous “major” version of SQL Server.
If you are still on the RTM branch of SQL Server 2008 R2, I would start thinking about and planning for how and when you are going move to the SP1 branch of SQL Server 2008 R2. You have some time, but at some point (probably in mid-2012), Microsoft is going to retire the RTM branch of SQL Server 2008 R2, which means that it will be considered an “unsupported service pack”. If you ever have to open a Support incident with Microsoft CSS, and they find out that you are on an “unsupported service pack” of SQL Server, they are not going to be able to give you the same level of support that you might expect…
Here is the current build chart for the two branches of SQL Server 2008 R2:
-- SQL Server 2008 R2 Builds SQL Server 2008 R2 SP1 Builds -- Build Description Build Description -- 10.50.1092 August 2009 CTP2 -- 10.50.1352 November 2009 CTP3 -- 10.50.1450 Release Candidate -- 10.50.1600 RTM -- 10.50.1702 RTM CU1 -- 10.50.1720 RTM CU2 -- 10.50.1734 RTM CU3 -- 10.50.1746 RTM CU4 -- 10.50.1753 RTM CU5 -- 10.50.1765 RTM CU6 ---> 10.50.2500 SP1 RTM -- 10.50.1777 RTM CU7 -- 10.50.1797 RTM CU8 ---> 10.50.2769 SP1 CU1 -- 10.50.1804 RTM CU9 ---> 10.50.2772 SP1 CU2