tvitty is an add-in for Microsoft Windows Media Center (TM) designed for your tv & remote. It lets you find download and watch videos distributed over the internet, right from your couch. tvitty currently supports bittorrent networks, and we're planning to add progressive download and streaming support. We use tvitty to distribute our own ad-supported content in certain regions, and promote free legal content worldwide.
(Only works in Windows media center for Vista. Need confirmation if this is the same for other people as well.)