Read a few good things about this - thought I'd share it..
http://vortexbox.org/about/
"VortexBox is a free, open source (GPL v3), quick-install ISO that
turns your unused computer into an easy-to-use music server/jukebox.
Once VortexBox has been loaded on an unused PC, it will automatically
rip CDs to FLAC and MP3 files, ID3 tag the files , and download the
cover art. Vortexbox will then serve the files to network media
players such as Logitech Squeezebox, Sonos, or Linn. The music files
can also be streamed to a Windows or Mac OSX system."
Cheers
Matthew