Microsoft Silverlight 4 Tools for Visual Studio 2010 (http://go.microsoft.com/fwlink/?LinkId=177428)
Microsoft® Silverlight™ 3 SDK
WCF RIA Services V1.0 for Silverlight 4 and Visual Studio 2010
WCF RIA Services Toolkit May 2010
Microsoft Silverlight 4 Tools for Visual Studio 2010 (http://go.microsoft.com/fwlink/?LinkId=177428)