Microsoft has released Service Pack 1 RTM for you to download as of 11 July 2011. If you want to download this RTM click on SQL Server 2008 R2 SP1 RTM.
For more information on what is included in this Service pack click on Service Pack Summary.
I am a Microsoft Data Platform MVP as well as a Microsoft Certified Master working as the Principal Consultant here at SQL Masters Consulting. When I am not working with the SQL Server Stack I like to get away to the Snow and spend time Snowboarding.