Jim Newkirk (of nUnit fame and one of the Microsoft folks behind www.CodePlex.com ) has been blogging about unit testing in forever ( most recently: Why you should not use Setup and Teardown in NUnit ).
Personally, I'll try using the shipping version on my own personal projects. At this point, it will probably not effect what I do at p&p.
Check it out and enjoy.
[Note: I added the testing flag since xUnit.NET claims to be extensible into an acceptance testing framework. Not that I consider EDD testing.]