Accuracy aside... I think its safe to say that...

1) BearShare
2) LimeWire
3) Gnotella
4) Gnucleus
5) MyNapster
6) Phex

From my own data LimeWire was close to but never surpassed BearShare and also from my own data at one point LimeWire and Gnotella were the same, but in others it showed LimeWire ahead, so its more likely limewire is more popular.

Phex and MyNap appear to be to close... the accuracy issue comes into play... from my own information they are tied, from yours it appears MyNapster is more popular, seeing as that is the case, I would say MyNapster is more likely more popular then Phex.

I did a download test like I said I was (downloading mostly mp3s of diffrent kinds of music and audio, and 1 avis) and the results only showed up for 3 clients (BearShare, LimeWire, Gnucleus), but this was only out of 14 connections (14 diffrent IPs, and 11 successful downloads many of which were in a short period of time)... and the results were similar to my earlier results showing LimeWire much more closesly to BearShare, but like I said this is only out of 14. (I need to free up some hard drive space now )