Yamaha is shipping a tiny, 19mph battery-powered scooter with an integrated iPod (controls on the handlebars), that plays through a built-in amp and loudspeakers. The whole thing weighs all of 100lbs and can be folded for storage.
(Thanks, Gaijin Biker!)
Update: Gaijin Biker sez, "The iPod-compatible model is a "concept" version only,
that is NOT being sold to the public (at least yet).
The version currently on sale has no iPod
functionality."