One of the things I wanted to show at my Interactive session on unit testing tips and tricks at TechEd this year was how you can "Stub" out results from LINQ Queries, or mock\stub Extension methods in .NET 3.5 TypeMock, is a very powerful mocking framework. much more so than Rhino Mocks or NMock, because it allows isolating static methods, private methods, constructors, and basically anything you can do in IL, because it uses the .NET Profiler APIs to intercept method calls and do whatever it wants with them. In that regard, it is almost too powerful because it rids of of the need to actually design your code for testability, and just test it as is (how you actually write the tests is another matter for another post).
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