Microsoft Silverlight 4 SDK Beta contains online documentation, online samples, libraries and tools for developing Silverlight 4 applications. Usage of the SDK is subject to the SDK License (included in the package). “The toolkit has been updated to provide support for Visual Studio 2010 and Silverlight 4 beta development. The Toolkit provides numerous controls for your application and source code is also included for these controls using an Open Source license,” the Redmond company added.
Download: Silverlight 4 SDK Beta