Over at The Web of Knowledge blog there is a huge list of well over a hundred torrent sites thoughtfully organised into categories from music (general, bootleg music, mixes and unsigned, specific bands) to television (general, specialized, sports) and you get the idea.
If you’ve been looking for a place to start having a look at this whole torrent thing, there’s sure to be a site in here that will whet your appetite.
If you aren’t sure how to get going with BitTorrent, I would reccomend Azureus, it’s a well supported Opne Source program, have a look at http://azureus.sourceforge.net/ and there is a good setup guide at http://www.paulstamatiou.com/2005/10/02/how-to-configure-azureus/