NowStream is a web application that was developed during this weekend's TechCrunch Hackathon by Carnegie Mellon student, and future Google intern Sohail Prasad. The web app allows you to stream torrents directly to your iPhone via Mobile Safari.
The app allows you to grab any torrent link, paste it in the web interface of the app and start streaming. There's obviously stuff happening in the background but we don't know much about it so far...