Breaking out of the Browser
If you've been looking for a good demonstration using the new Silverlight 3 capability of running applications outside of the web browser, Mike Taulty has a screencast demonstrating exactly that on Channel 9. Mike's screencast is the first one I've seen that demonstrates the same application on both the Windows and Mac versions of Silverlight, but the two are similar enough that it's more useful to see that it does work rather than how to do it. You'll also get a quick demonstration of consuming a web service from Silverlight.