I'm working on switching from VS 2005 to VS 2008. I just tried running some unit tests and got the following dialog:

Hooray! I've been trying to figure out how to implement automatic test cleanup myself, but I (fortunately) hadn't had time to devote serious effort to it. Up to this point, the TestResults directory would just continue to grow and grow until you either went in deleted the directory or ran an Ant target we have for ensuring any testing left-overs get mopped up.