I would like to share you my article on Defaultdotaspx.com
It describes the basics of unit testing then a few steps about how to use unit tests in Visual studio 2008.
I hope this article helps to understand the basics so more complex scenarios would be easier.
Using Unit Test in Visual Studio 2008 Professional
My brother Bassl started to blog about windows clients applications, today he posted a new class browser tool, I think it's great and useful, but still need some more debugging since it's the first version, anyway you can browse your classes here, test it and give him your feedback.