Microsoft announces the availability of Service Pack 1 as Community Technology Preview for SQL Server 2008 R2. Here are some of enhancements come with SP1;
- Dynamic Management Views for increased supportability
- ForceSeek for improved querying performance
- Data-tier Application Component Framework for improved database upgrades
- Disk space control for PowerPivot
Here is the link for downloading: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=bd200f8e-ba8a-45e3-af59-e28a9e2d17df&displaylang=en
Note that this is CTP, not for installing in live environment.