I just tried to install the VS2008 SilverlightTools Alpha, but I immediatly ran in to an error. The installation couldn’t start beacause VS2008 was not installed. This suprised me because I just installed thirty minutes before. A some searching I found out that I needed to install the Visual Web Developer.

You can install this by running the VS2008 setup again an choose to add features. Now the Silverlight tools setup runs flawless.