Maybe I'm paranoid but...

The Warez p2p client did some ... weird things to my computer. Screwed it up. After I installed it, I just had all these holes in my computer and the next thing I knew I had to reformat ;-PP

Morpheous is anohter service I don't trust.

I never trusted limewire when it was closed source.

I don't really trust bearshare...(that bear is freaky)

Overnet negatively effects my computer the most (slows it down), but it's never destroyed my system. (even if it keeps giving me that trojan virus warning that they SWEAR is fake) =p=p

WinMX has a small network, but it's the most trustworthy program, IMO.

I'd like to try Ares, I heard about that the other day.

But I'm not sure...
What beats Limewire? Opensource, Multi-platform, Large network.
It's great!
Even if it is written in Java ;-P