Silverlight mashup with Digg.
Scott Guthrie has a great eight part series titled First Look at Silverlight 2 where he walks you through building a Silverlight 2 sample app from scratch. The walkthrough highlights almost all of the key features of Silverlight 2 Beta 1. The walkthrough is so comprehensive that I have been using a slightly modified version of it for my Silverlight 2 presentations. Since I am a big fan of seeing vs. reading, I asked Scott if it would be ok if I turned his written walkthrough into a video walkthrough delivered as a Channel 9 screencast.