ADO.NET Entity Framework

http://code.msdn.microsoft.com/dtl401sample/Release/ProjectReleases.aspx?ReleaseId=2831
http://msdn.microsoft.com/en-us/magazine/dd569757.aspx
http://blogs.msdn.com/adonet/pages/walkthrough-test-driven-development-with-the-entity-framework-4-0.aspx
http://msdn.microsoft.com/en-us/library/dd456815(VS.100).aspx