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"The ASP.NET 3.5 Extensions Preview is a preview of new functionality being added to ASP.NET 3.5 and ADO.NET. The release includes ASP.NET MVC, ASP.NET Dynamic Data, ASP.NET controls for Silverlight, ADO.NET Data Services, Entity Framework runtime, and new features for ASP.NET AJAX."
http://www.microsoft.com/downloads/details.aspx?FamilyID=a9c6bc06-b894-4b11-8300-35bd2f8fc908&DisplayLang=en