What about building an in-line radio, similar to an in-line remote, Get the smallest radio you can find and wire it into the headphone cable, or use a male to male cable from ipod to radio and then plug haedphones into radio. Now that I think of it, there is most likely already an ipod accessory that does this...
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PB G4 15" 1.2ghz - Pismo G3 400 mhz - iBook G3 500 "Jukebox"
"SawSmurf" G4 500 - Quicksilver G4 Dual 1ghz modding...