SIlverlight 2 SDK Beta 1 - Control Samples
Interesting to see that the samples of Silverlight controls have been shipped with associated MSTest projects. I think this is first for Microsoft.
Now this is a great way to see the intention behind the way any bit of code was designed. A good test set is far more use than most documentation, as it truly matches the code features. If you are doing TDD then it cannot get stale.