I mentioned recently the availability of Visual Studio 2008 SP1 Beta here.
If you try to install this you might get the following error if Silverlight Tools Beta 1 is installed on your machine:
"Microsoft Visual Studio 2008 SP1 (Beta) does not apply, or is blocked by another condition on your system. Please click the link below for more details".
To fix this, simply uninstall the Silverlight Tools Beta 1 package.
See the release notes for this SP here.
When you do finally get this installed, one of the upgrade features of VS 2008 is the ADO.NET Entity Framework for LINQ to Entity support - very cool. I will be talking about this soon...