Jonathan Carter of Microsoft provides a great overview of the enhancements to Data features provided by ASP.NET 4 and Visual Studio 2010. He covers enhancements to technologies such as the Entity Framework, ADO.NET Data Services, and Velocity quite excellently.
There's lots of great new capabilities in the ADO.NET technologies in .NET Framework 4, including paging capabilities in ADO.NET Data Services and support for different development methods (model-first, code-only, etc.) in ADO.NET Entity Framework. In this video, Jonathan Carter highlights these exciting new features.
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Link to source: http://channel9.msdn.com/learn/courses/VS2010/DataPlatform/DataPlatform/