Michael Scherotter is doing a web cast on the topic of creating a Vista Gadget that leverages Silverlight for radio and TV playback:
Now that many radio and television stations are streaming their content over the web, there are now multiple venues to let users listen to and watch that content. This live webinar will demonstrate how to build a single Silverlight application to playback that content. The Silverlight application can then be distributed both as a sidebar gadget for Windows Vista and as a cross-browser, cross-platform web player that listeners can put on their web pages or blogs.
You won't want to miss this one. -bob