suprnova is great.
just a little word of warning though for those that use it a lot:
1) the site is extremely well known. It's been linked to by CNN, NYTimes, LATimes, News.com, Slashdot, everything. It's no secret.
2) BitTorrent, by its very nature is not anonymous. If you're on the same torrent as me, I know your IP address. It's even easier to find the people who are sharing / pirating files than it was with the old napster days. Instead of searching for, say, Green Day, and having to check every individual user, I can now connect to a Green Day torrent, and I'm instantly given a list of every single IP actively distributing it (basically anyone who connects to the torrent basically announces to the world that they're downloading the file, and sharing it to the world).
3) The only reason why SuprNova.org has not been shut down yet is because the legality of running the site is a kind of grey area, which normally isn't a problem with the DMCA and all, but nailing him in Slovenia is (yes, the 1 man who runs the site is very public, and his name has appeared in newspapers in relationship to the site). Getting contact information from providers such as Comcast however, is really easy
Anyways, not trying to scare anyone, but just repeating the obvious risks.