Sometimes someone makes a gadget that's just so useful and cool that I have to feature it here on the front page. MikeB314 yesterday put up just such a gadget.
Sidebar Player is a video player for the Windows Vista Sidebar that lets you load in any online streaming video feed and watch it either on your sidebar directly, or expand it to a larger window on your desktop.
Originally made to watch NASA TV, you can sub in any video stream, or play local audio/video files.
Probably the coolest Sidebar gadget I've seen yet!