If you’re a web developer who is new to Silverlight 4, you should make this your first stop. This whitepaper walks you through the new features in Silverlight 4, and points out learning materials and additional Silverlight resources.
This whitepaper discusses the new business-centric features of Silverlight 4, tells you how Silverlight can help you create rich media experiences, and how you can use the new Expression Blend and Visual Studio 2010 tooling enhancements, along with new Out-of-Browser features.