Installing SoulSeek (nicotine 1.0.6) on Mac OS X 10.2 or 10.3 — a SoulSeek client via X11 isn’t ideal, but it’s better than nothing.

The instructions are easy enough to follow. The only thing I’d add is that setting up Fink will take a good amount of time, about an hour in my case. The instructions note that the last step, compiling nicotine itself, will take many hours, but it doesn’t estimate times on any of the other steps.