I download mostly tv shows. No tivo and cant f'n stand commercials. For this, I use http://www.eztv.it/frontpage.php for any shows not on there and for other random shit, I use http://www.torrentz.com/search as it searches over quite a few sites, so there's really a few I use, like btjunkie, monova and a couple others. Not only that, but it offers extra trackers not always listed in the actual torrent that you may add, if you'd like. Though, generally the 'default' ones are enough. Occasionally, I use http://isohunt.com/ and http://www.demonoid.com/files/ and rarely http://www.sharereactor.com/ and http://www.thepeerhub.com/browse.php.
I'm a member of http://www.fullcontactzone.tv/ which is any full contact sport, predominantly mma, kickboxing, etc but includes some racing, various American sports, wrastling, instructional, mma shows, blah blah blah.