The flexibility on the Pre-processor T4 output from Entity Framework 4 is light years ahead of .Net3.5. Finally its realistic to have a go implementing a Repository pattern using EF4.
Apart from that, my next favourite new feature in .Net4 is generic type parameter inheritance compatibility. Might sound trivial but from a framework building point of view when you dont always have access to concrete types its amazingly handy to be able to cast IList<PersonalCustomer> to IList<Customer> where PersonalCustomer : Customer...
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