I missed this post in all the MIX excitement last week but it is a great read. Rob talks about the work he did to port the Silverlight rendering stack to run on Windows Mobile and work with the .NET Framework. His post has some great information and a bunch of screenshots from the mobile MLB demo shown in the keynote. Rob has been working with the folks on our team, specifically to get media playback working on devices, and it's really great to have something this polished to show after only one month of development effort.
I've linked the screenshots from Rob's post below.