I’ll be presenting Stubs and Moles at the Visual Studio User Group on November 3rd. See you there…

Stubs is a lightweight framework for test stubs and detours in .NET that is entirely based on delegates, type safe, Refactorable, debuggable and source code generated.
Stubs also allows to replace  any .NET method with a user-defined delegate, including non-virtual/static methods in sealed types. Stubs is fully integrated into Pex , an automated white box test generation tool for .NET.
http://research.microsoft.com/en-us/projects/stubs/