.NET 3.5 SP1 and VS 2008 SP1

Microsoft released today a Beta version of the .NET Framework 3.5 along a Beta version of the Service Pack 1 for Visual Studio 2008.

ScottGu describes the new features here:
http://weblogs.asp.net/scottgu/archive/2008/05/12/visual-studio-2008-and-net-framework-3-5-service-pack-1-beta.aspx

If you're using the Silverlight Tools, SP1 is not compatible.  Make sure you read this:
http://blogs.msdn.com/webdevtools/archive/2008/05/12/error-installing-visual-studio-2008-sp1-beta-and-silverlight-tools-beta-1.aspx