Bittorrent is a peer-peer protocol used for file distribution. What is good about it is that every downloader also acts as an uploader. The file is divided into smaller sized chunks, each with SHA1 hash. This is great for countering "slashdot effects", downloading the iso images immediately after they are released. I doubt, though, if it is very useful for longer term links...
There are many websites which host the torrent files for movies, music, TV shows, software apps.
It will be a cool project to keep searching for keywords appearing on such websites and automatically download the torrents to browse. May be have RSS feeds based on keywords... Hmmmm...