One thought that could be interesting (and probably covered a million times here already) would be a CD changer that simply "remembered" (ripped and spooled to disk) every CD it saw. You could load up 6 CDs, listen to them in realtime, and the system could be ripping and compressing in background.
Good Idea, BUT.. I think the recent won-lawsuit against mp3.com for a similar service (albiet internet based...) would prevent anyone from exploring that option for a while:(
-mark
...proud to have one of the first Mark I units