Bret's Blog Post: Silverlight 4 Beta Control Namespaces, Assemblies, and Paths....
Click Below to Download the Visual Studio 2010 Beta 2 Project File
Click Below to Download the ControlDetails.xml data file
SLControlsInfoV3.zip - A VS 2010 Beta 2 Solution that Targets SL3
ControlDetails.xml - This is the data shown below