Well, it's official. One of my predictions (http://theruntime.com/blogs/devprime/archive/2008/09/02/prognostication.net.aspx) has somewhat come true. Microsoft officially announced today on the ADO Team Blog (http://blogs.msdn.com/adonet/archive/2008/10/29/update-on-linq-to-sql-and-linq-to-entities-roadmap.aspx) that starting with .NET 4.0 (the next release), Entity Framework will be THE choice of relational LINQ technology, and LINQ to SQL is taking a back seat. This all made sense to me, because LINQ to SQL's limitations were just lame. It looked and felt like a tie-over product, meant to hold the LINQ to DB line until something better came along. The problem was that the "something better" (EF) still needed a lot of development work and wasn't ready...