Adam Kinney recently twittered about some videos that Don Burnett linked to on his blog from Mix 08 for Silverlight Mobile that are really cool. Silverlight 2 has some great features and I think the mobile offering (once released) will really simplify the process of building mobile applications. Cool stuff!
Update: Additional videos that demonstrate Silverlight Mobile in action can be viewed at http://blogs.msdn.com/Giorgio/. Giorgio Sardo owns the blog and let me know that several more videos will be released as well. His blog is the place to visit if you're interested in staying in touch with Silverlight Mobile announcements and videos.
If you're interested in learning more about Silverlight 2 you can view 8 videos I put together based upon Scott Guthrie's written tutorials.