Hello Ric Way,
As it seems LINQ is becoming the dominant technology and the design of Sitefinity allows us to change the data access layer fairly easy, we are seriously considering moving to Entity Framework in the near future. We won't do that all at once, though.
Here is some more. LINQ to Entity is a LINQ driver for ADO.Net Entity Framework. Entity Framework, on the other hand is another layer of abstraction and does not represent actual data. It will rely on drivers on its turn for actual data. Unlike LINQ to SQL, where objects directly map to database tables, an Entity can consist of several tables or parts of tables. EF will be database independent but will have built-in support for SQL Server.
the Telerik team