MTV Overdrive is a rather interesting flash-based "broadband video channel" - complete with Olay commercials and "coming up" (but only works with IE 5.5, Flash 7, WM 9 and decent hardware underneath).
Haven't watched that much, but even without the vid-optimizer it looks good full-screen and most importantly sound really good. Definetly one to watch to see how it evolves over time in terms of available content.
