Rx (Reactive Extensions) Video Tutorials

Rx is meant to provide simpler asynchronous application design. These are the video tutorials I could find on Channel 9. I am more interested in the silverlight / WPF usage of this framework:

Writing your first Rx Application : a taste of Rx
DevCamp 2010 Keynote - Rx: Curing your asynchronous programming blues : the best intro
Kim Hamilton and Wes Dyer: Inside .NET Rx and IObservable/IObserver in the BCL (VS 2010)
Wes Dyer and Jeffrey Van Gogh: Rx Virtual Time

Rx Update :  Async Support


From Silverlight.net: 
Asynchronous programming with Rx : by jesse liberty (nice to get a taste of it)


Incomplete:
Reactive Extensions API in depth: intro