If you happen to be at Mix and want to chat about Windows Media Center head over to the Sandbox area and ask for Eric Voetberg, Jason Suess or Andrew Adamyk. While there you can pick up a DVD chock full of resources for those wanting to learn more about developing for Windows Media Center in managed code and / or Media Center Markup Language. It includes the latest rev of the SDK (it's already posted to MSDN online and will be going up to the download center in the next day or two) as well as some fairly extensive training materials.