Microsoft's Chris Anderson and Don Box show off a very special demo app. It involves a piano, WCF and WWF and WPF and some pretty bad singing.
Chris and Don continue a tradition that started in 2003. Go watch this MSDN TV Special Holiday Episode III (9m17s).
BTW: I could download the 20 MB video in just 30 seconds. I love my new 666 KB/sec ADSL speed!