SQL Server 2008 SP1 Public CTP is now released. The bits can be downloaded from here
We remain committed to our plans to keep service packs contained (ISM model), focusing on essential updates only, primarily a Roll-up of Cumulative Update 1 to 3, as well as fixes to issues reported through the SQL Server community. While keeping product changes contained, we have made significant investments to ease deployment and management of Service Packs by introducing: Slipstream, SP Uninstall, and Report Builder 2.0 Click Once capability.
This announcement will also be posted on: