Speaking of listening to music, this is probably the stupidest idea ever, but...
I think it'd be pretty cool to actually install some wireless earphones (if they exist?) into the helmet itself.
Your iPod nano or similar would be mounted inside the front panel of the scooter, and connected to the battery.
Buttons would be integrated into the other general controls around the handlebars - a Play/Stop button, and a Volume knob: push and hold forward or back to increase/decrease the volume, press without holding to mute (safety - just in case you accidentally turn it up too loud, it is easy to mute with one press). An on/off button near the key that charges the iPod or stops it from charging.
A small plug can be pulled out from the back of the helmet. Near the helmet hook on your scooter there is a plug-hole connected to the battery - this is for charging up the wireless earphones.
Of course your iPod comes with Bluetooth for giving it new songs (does that work?) without having to take off the front panel.