Silverlight 2 Beta 2 with VS2008 SP1
Just spotted this on Amy Dullard's blog:
If you previously had Silverlight Tools Beta 2 installed, after installing SP1, if you open or create a Silverlight project, a dialog will open stating:
Microsoft Silverlight Tools is unable to open the project due to a missing patch for Visual Studio. Please download the latest update from: http://go.microsoft.com/fwlink/?LinkID=120032.
An updated patch that works with Visual Studio SP1 is included in the Silverlight Tools install at http://go.microsoft.com/fwlink/?LinkID=120032. Once installed, Visual Studio will once again be able to open and create Silverlight projects
So go update your Silverlight tools.