Soulseek is still alive 12 years ago
It still surprises me when I hear this, but then again, I've been a user since the early days. I think the main reason that it's survived is the user community. There are vast treasure troves of (usually) high quality music a query away. I still hit up the chat rooms occasionally for listening suggestions.
If you're not into scouring trackers or music blogs for more "obscure" tastes, or even if you used the program before it was ported to the QT framework, I would recommend you check it out!