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Since that other thread seems interesting, I decided I want actual stats that might give some representation. I've tried to include everything that I could.

I tried to group them by network when possible...

KaZaA/KaZaA-Lite K++ [Fast Track network]
iMesh/Grokster [Fast Track network]
Bit Torrent
eDonkey2000/eMule
OverNet
WinMX
Newsgroups
DirectConnect/DC++
IRC
Gnutella (XoloX, Morpheus, BearShare)
LimeWire