Visual Studio 2008 SP1 Beta and Silverlight Tools Beta 1
Important note for folks who are planning to try the beta of Visual Studio 2008 SP1:
Microsoft Silverlight Tools Beta 1 for Visual Studio 2008 is not compatible with Visual Studio 2008 SP1 Beta. The good news is that Silverlight Tools Beta 2 for Visual Studio 2008 SP1 is coming soon. Until then you will not be able to install both Silverlight Tools and Visual Studio 2008 SP1.
Until Silverlight Tools Beta 2 ships you'll need to uninstall Silverlight Tools Beta 1 to evaluate Visual Studio 2008 SP1 Beta. Likewise, if you've already installed Visual Studio 2008 SP1 Beta then you'll need to uninstall it before installing Silverlight Tools Beta 1.
Hit the link for complete instructions.