Bit torrent, but itÂ´s having a hard time right now. You can still can find some torrent sites, but itÂ´s alittle harder. Why i like BT is you are only sharing the file you are downloading. That means that they cant snoop around in a share folder and see what you have. I wonder how many people got themselves into trouble that way?
Also the speed in BT is great. It Â´s one of the fastest if not the fastest P2P out there.
We are at a transisition period with BT because of last weeks raid. But right now,it still the best P2P. If you are into a GUI, try to search after "Bitlord" It reminds me alot of Karzaa interface.