I just downloaded the
Python/Linux client for
SoulSeek. It's pretty doovy, and quite a decent replacement for AudioGalaxy. One nice thing about it is how many specialist genre fan communities there are on it; rather than just the usual Limp Bizkit/Britney Spears crud that clogs up MP3 sharing networks, you can find all sorts of indie, IDM, post-rock, electronica and so on.
(A search for "Takako Minekawa" returned a lot of hits, and even something obscure like "Fog and Ocean" returned a few.)
One annoyance is that the interface depends on the wxgtk UI libraries, which are hardly part of every Python system. But the code looks modular enough, and hopefully someone will make a command-line-mode plug-in or interfaces for other OSes. (MacOS X Cocoa would be nice.)