I was thinking about open APIs the other day and the Prius's support of Bluetooth. Imagine the possibilities if they offered hooks into all of the cars services... Streaming mp3s from your bluetooth enabled iPod to the car stereo. Car LCD integration w/ your bluetooth GPS unit. Logging mileage and other info to your laptop for reimbursement purposes. Instantly dialing 911 on your cell phone if your airbag goes off.
Sigh, when will the realize that opening up APIs to users gives them free developers and features developed for free.