I use Bittorrent and occasionally Kazaalite.
Bittorrent is a little tricky sometimes. But speedwise it’s better than anything else out there. I’ve hit 600+ kbps. It all depends on number of seeders, time you’re downloading, etc, etc.
Sometimes it does take a little bit to connect to peers, which is what stopped me from using it earlier. But, once I figured that out, it was smooth sailing and I rarely use anything else. I’m also impatient hehe.
pwtorrents.net (for the wrestling fans out there)
fullcontactzone.com (wrestling and other sports)
I know of a few others that are decent. Really, bittorrent is the only worthwhile file share system. IMO anyway.