SP1 include new investments:

· Slipstream – You are now able to integrate the base installation with service packs (or Hotfixes) and install in a single step.

· Service Pack Uninstall – You are now able to uninstall only the Service Pack (without removing the whole instance)

· Report Builder 2.0 Click Once capability

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=66ab3dbb-bf3e-4f46-9559-ccc6a4f9dc19