The WPF test team is hard at work to provide value through a simple and componetized library of public test APIs.  The WPF TestApi library has just released a v0.2 which includes new visual verification features, command line parsing features, an auomated application controller, and new unit test samples. 

Ivo has a great post about the visual verification APIs and usage that you can view here.  Please try it out and let us know your feedback!