Now you can find out what torrents are available at Torrentz.com (via Robert Scoble). Interesting thing is that, nstead of using spiderbots, they are using people as bots, meaning users register torrents streams they either own or found. Is it working? You bet.
What's available? Rips of all kinds including movies, porns, music, toons, appz, warez. For example, one of the most popular torrent is Adobe Photoshop CS 8.0. I am sure RIAA will be chasing those torrents soon if not already, but I am not sure if Torrentz.com itself is illegal or not.
There is a bit of drama behind the site too. Apparently, some joker hacked the site to steal the source code and setup his own site, TorrentReactor.net, with minimal changes. The guy even admits he stole the code. I guess he thought stealing from someone who encourages theft is not really stealing.
It's a dog eat dog world out there.