Using a Stickduino?
 

http://spiffie.org/kits/stickduino/start.shtml

Would it be possible to use this as a basis for an OBDuino? One possible problem that comes to mind is power...the MaxSerial one just wants 7 to 18v, but I don't see anything about that for the Stickduino...I know USB is 5v though.

Edit: Also, would someone mind saying what the dimensions of a "normal" arduino such as a MaxSerial are? The reason I'm asking about this stick thing is because there's a place in my car I'd like to put this, and I am not sure if a "normal" arduino will fit.