I've been using Shareaza for quite some time now. It kinda emulates Bittorrent, Edonkey, and Gnutella pretty well. I see that it wasn't on your poll list either, SniperWolf. I used to use Kazaa, ages ago though.
Kazaa (or Kazaa Lite)
Ares (or Ares Lite)
Napster
Direct Connect (DC++ or Neomodus)
Imesh
WinMx
Morpheus
other (if other please state, or if its a popular one i missed I'll add it)
Limewire
eMule
Soulseek
I've been using Shareaza for quite some time now. It kinda emulates Bittorrent, Edonkey, and Gnutella pretty well. I see that it wasn't on your poll list either, SniperWolf. I used to use Kazaa, ages ago though.