Kazaa has really gone down hill. It has the most user but draws the most attention too. You have LOTS of record and movie industry people putting fakes on there to discourse use. I go on Kazaalite every now and then but that's about it. And I never download 128Kbps MP3 on Kazaalite unless it's a really old one. I you see 128kbps of a new MP3 9 outta 10 times it's gonna be a fake. Mostly everyone encodes at 192Kbps these days. Kazaa/Kazaalite is still pretty good for software and ok for porn. Winmx is my favorite P2P now. But use both.
Usenet blows all P2P out the water. No one posts fake shit.