I've been working on a project involving Silverlight and the Beijing 2008 olympics. We demonstrated this at MIX 07, and the session is online here: http://sessions.visitmix.com/default.asp?event=1011&session=2010,2011&pid=XB005&disc=&id=1557&year=2007&search=XB005

We also had a hilarious video interview with the Channel9 / On10 folks. You can see it here: