Sounds like an interesting idea. With features such as "Wide operating temperature range, -20°C to +70°C" it sounds well suited to staying in the car too. I was thinking $50 was a bit expensive but considering all the IO it's got, you wouldn't need very many:
- 10 Base-T Ethernet for networking
- Dual serial ports
- Dual 1-Wire® net interfaces
- Dual CAN (Controller Area Network) controllers
- 2-wire synchronous serial bus
- General-purpose digital I/O

The dual serial ports could be used one for GPS and one for OBD-II. You'd have to write a some code to transfer the data via the network... maybe via HTTP. I'm not sure what type of approach to take on this. This would have the advantage of not needing custom drivers like what I was thinking about.
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--The Amigo