Here’s the main “Getting Started” page for Silverlight. This will give you the links to download the tools for VS 2008 and the bate SDK.
MSDN Silverlight Developer Site
Runtime/Plug in Overview
Silverlight 2 Beta 1 – Development with the .NET Framework
Road map info from Scott Guthrie’s blog….
A free, fully functioning professional quality Silverlight2 data grid from DevExpress with full source code. Pretty slick.