Microsoft Silverlight is a cross-browser, cross-platform, and cross-device plug-in
for delivering the next generation of .NET based media experiences and rich interactive
applications for the Web.
Get Started Building Silverlight 2 Applications
Install Visual Studio 2008 then Install Silverlight Tools Beta 2 for Visual Studio 2008
This add-on to Visual Studio 2008 allows you to use .NET to create Silverlight 2 Beta 2
Web sites. The Silverlight 2 Beta 2 Runtime and the Silverlight 2 Beta 2 SDK are
installed as part of this install. For additional information read the
overview. Note if you have Visual Studio 2008 Service Pack 1 Beta installed, please see
this information for details on installing correctly.