If you are coming to the San Diego .NET Developers Group meeting tonight I hope you will be their early for my talk titled "What’s New In VS 2008 SP1". Lots of new additions to this SP, not just bug fixes. Below is a link to the presentation.
Everyone should check this out. Lots of info on the new version:
http://go.microsoft.com/?linkid=9369515
The .NET Framework 3.5 Enhancements Training Kit includes presentations,hands-on labs, demos, and event materials.