Hi Andrew, I'm a great fan of your product and was recently searching for a nice way to implement this to the computers around the house (I dont have a squeezebox yet and softsqueeze is yet to impress me)
So, I went on a web hunt and discovered these three ideas:
Sockso – http://sockso.pu-gh.com/
Subsonic (the best one imo) – http://subsonic.sourceforge.net/
GNUMP3d – http://www.gnu.org/software/gnump3d/
I liked being able to download playlists that link directly to the server. I think these have potential to make vortexbox even better. Unfortunately, I managed to break my system attempting an install, so I'll await further instruction from you.