As you know, i love Silverlight and WPF. Check out the new case study that Microsoft did on NBC and the new Silverlight app for Sunday Night Football:
http://www.microsoft.com/casestudies/Case_Study_Detail.aspx?CaseStudyID=4000006602
The awesome support for smooth streaming is awesome. The video features are wild too.
I did a demo for a customer and it took me 10 minutes to have a working video app in Silverlight. Wild stuff.