http://channel9.msdn.com/Shows/Visual-Studio-Toolbox/Unit-Testing-with-Microsoft-Fakes
In this episode, Robert is joined by Carsten Duellmann and Ricardo Wickel, who show us how to improve our unit test using Microsoft Fakes. Fakes help you isolate the code you are testing by replacing
Currently , I'm using Microsoft Fakes, and I have to tell that I'm very happy with it, in special with Shims, which allows me to replace some code by my own implementation and isolate the code I'm testing.