iHome's iPod speaker for push bikes
iHome's new Bike to Beach iH85B is a tough water-resistant iPod speaker case that clamps to your bike frame.
You can then control your tuneage via the wireless handlebar-mounted remote control.
When you've cycled to your destination, the speaker case can be taken off and used as a portable speaker system.
Coming soon in the States, it will be about $100, link to product page below.