I've missed out on the MP3 craze, I'm afraid. If I were to do anything today, it would definitely be either Sirius or XM satellite radio.

Try this link for an interesting speaker concept.
Helmet Speakers

Keith
Houston
Ridin'Texas
'04 Speedmaster
AI removed, Pingle, UNI Filter, 1 shim, straight-through slash-cut TORs, Stage 1 DynaJet, 140 mains, 3 turns, 16/42 final drive, 115K
2020 T120 Black