I haven't used bit torrent (spit) don't like the sound of it, as you can't cap speeds on it (from what I've heard anyhoo)
I use and have used edonkey, emule, currently using emuleplus, which rocks
I've had a letter from my ISP via one of the big movie companies stating details of a file I was sharing at one time, it is scare tactics, and I was cheeky enough to e-mail both my ISP and the film company back (I just didn't give a flying fuck) saying:
"yeah, well so big deal, you caught me with my pants down, however, the movie I had downloaded and was sharing, I had already pre-ordered on play.com, but wasn't out for 3 months, showing them a screen cap of my play account, and further advising them I had seen it at the cinema, I enclosed a scan of my cinema ticket."
They of course weren't interested in all that, nor were they interested to hear my theory on P2P progs in general, and how they generate sales of CD's and DVD's (I run a small record label myself, and know for a fact that using soulseek has generated more sales of my albums)
All the movie company said was
"Thanks for deleting the file."
My ISP said "Thanks for deleting the file, you probably wouldn't have been caught if you weren't sharing the file"
So, lessen learnt, as soon as files complete now, I've set up a rule to move them to another folder.