NUnitAddin
I finally took the time to check out NUnitAddin today and I must say that I am extremely impressed. I am not going to bother to go into details about what the program actually does since so many others have already done this. Instead I would like to say how impressed I was when I downloaded the source from Sourceforge. This is an incredible piece of work and I have not learned more about .NET since back in the .NET Beta 2 IBuySpy days. I would highly recommend you check this out especially if you are planning to do any VS.NET integration work.