New reverse engineering capabilities with EF

By now we should all know that the ADO.NET Entity Framework (EF) provides mechanisms for reverse engineering a database schema into a conceptual database model. However, limitations prevent complex hidden data hierarchies from being accurately represented in the model generated by the EF. EdmGen2 introduces new capabilites (data mining techniques) to determine these relationships so that the conceptual model can accurately reflect them without a developer needing to explicitly define them.

http://blogs.msdn.com/adonet/archive/2009/04/04/edmgen2-now-with-reverse-engineering-options.aspx