I don't know a lot about Bittorent, but here's some information that emailer Doug sent:
BitTorrent clients: BitTorrent http://www.bittorrent.com/
Azureus http://azureus.sourceforge.net/
Video players: VLC http://www.videolan.org/vlc/
(Justgoing off some of the comments--there seems to be some confusion fromsome of the users and this might help...) Please feel free to add othertips... http://www.bitcomet.com/