The best p2p client (well maybe not the best) but the one i use the most is ares,
to me iz so easy to use, i get good download speeds and it also has a place where you can chat.

Its really easy to use and all your filez go directey into the library and it comes with a music player.
and itz own web browser

itz all i use now

www.aresgalaxy.sorceforge.com