I have been unable to find a satisfactory file sharing client for OSX, but one I am about to try, and those real nerds of you should try is pslsk try soulseek (soulseek.org) for the pc version, its a pretty good piece of software, nothing impressive, but the hetwork has A LOT on it, a lot of good independent stuff, and thats matters more to me than the merits of the software (but less than if there is gator or tha bull on it)..but there is a python version on their site and it has instructions with how to run it on OSX (wooo *nix)...it requires using GTK, but might be worth it since there isn't anything else out there