Best peer to peer software ?

i'd also recommend limewire specifically limewire turbo. i also recommend bearshare i use bearshare to download movies and games. sometimes there are files that i cannot find and download using limewire but i can find using bearshare or vice versa so i use both. what is great about limewire (new version) is that it supports torrent downloads. it is up to you what will you use... but for me i use both.

If you mean peer to peer software as in downloading files from one computer to another, I'd recommend Limewire. I use this all the time and you can find some really good stuff on there. It's real easy to use too.