Well, looks like Nick beat me to the post! If you're doing Unit Testing or TDD, this is a great installment of Hanselminutes you should not miss! Scott has always done a great job with putting just the right amount of content to keep the listener interested and productive. This is not just me saying it, but Chris Sells too!
If you want to learn more about unit testing and being test driven, you should also check out this other Hanselminute.