Last week Microsoft teamed up with the Presidential Inauguration Committee and CBS to stream the event live using Silverlight. The Channel9 team recently posted a nice video with Steven Woodard and Ben Waggoner discussing how it was done, and the historic last minute use of Moonlight (Silverlight for Linux) to provide an alternate experience for Linux users. Move Networks provided the video streams.  You can check out the quality of this stream on Demand at CBS. Be sure to click the Watch HD link and install the Move Player.