...Shareaza. No spyware, no ads, completely free. Don't use any of the crappy stuff.
Shareaza.com
Just go download it now, I'm sure you'll find it better than the rest. No, really. Kazaa has spyware, Kazaa lite has died, eMule is slower than my grandfather's car, and eDonkey is the same as eMule except with an idiot community.
Really, just use it.
...
HAVE YOU GOT IT YET?