On a slightly related subject..
My experiment with the little VAIO power booster for my ipod was a semi- flop. Anything above 35 mph, you can't hear the music through the helmet headset, even at full volume (back to the ear buds).
2nd experiment: FM modulator from Radio Shack. It plugs into the bottom of your IPOD and charges it while playing over an empty FM channel. While it works pretty good, it only brodcasts well in one place on the fairing, that puts in out in the direct sunshine and weather. :head bang: I'm going to take it back and get an older version that uses an antenna splitter box.
There's an answer out there somewhere. :laptop: