Microsoft has put together another version (this is rev 4) of their WPF Application Quality Guide, a fairly complete set of tasks and ideas around writing good quality apps using the Windows Presentation Framework.
A few things to note:
I don't subscribe to the sample tests they provide and think they're a bit of a joke so squint your eyes when you read the guide. For example, according to ECMA-355 standards, a new operation can never fail yet they do silly things like Assert.IsNotNull(p) on the Person object. Awesome!
I would never name a test PersonConstructorTest1 and hope you don't think this is a recommendation.
The PersonConstructorTest2 is invalid as the assert will never get called. Again, this is not a best practice or even a guide on writing unit tests. It's supposed to show you concepts around it, but we're big boys and girls now and know better than this.
While it's considered a "guide" they mention "best practices" but don't call it that. I don't see any difference between "guide" and "best practice" and again, don't agree with some examples in this guide so you should apply some kind of nerd-filter to it in order to make it work for you and go read a real book on writing unit tests.
Overall it's a good place to start when looking for resources on writing WPF apps and has some great links on real "Best Practices" for designers and developers. Check it out.