Microsoft has released an updated version of the Silverlight 1.1 Alpha Tools for Visual Studio 2008, which are now available for download.
The download includes VB and C# project templates, XAML IntelliSense and SIlverlight debugging tools. It also integrates with Expression Blend. The download, however, is not compatible with the Visual Studio 2008 Express editions.
Get the Silverlight 1.1 Alpha Tools for Visual Studio 2008 here.