Check it out Dash Express.

possibly the best GPS / driving aid out there.
we need to get something like this built into the dash of EVERY car.
I believe its built on the Open Moko Open source (mobile phone) platform.

This GPS is TWO way which means not only does it recieve location information but it also sends anonymous data up giving a real time update of traffic conditions for other dash express users to use. in an ideal situation if everyone had a dash express the the device could know of road blockages as they happened break down lanes would be avoided. The device can calculate the fastest possible route using the information collected from other units giving you a time arrival with uprecidented accuracy regardless of traffic conditions.

http://www.dash.net/