Just read Test-Driven Development in Microsoft.NET by James Newkirk and Alexei Vorontsov.....
http://www.bookpool.com/.x/6df7cmhfd6/sm/0735619484
http://www.amazon.com/exec/obidos/tg/detail/-/0735619484/qid=1084853460/sr=8-2/ref=pd_ka_2/104-9734108-2673525?v=glance&s=books&n=507846
http://www.microsoft.com/MSPress/books/6778.asp
Clear and consise, it lays out the fundamentals of TDD, how to approach it, and how to use it in the real world. You can read it in a few days, but it will change your development forever. It will become required reading for any project team I lead in the future.....
Go get it!