OK so i started work on a car pc software a couple of weeks ago, here is some progress so far - appologies for poor quality jpg (and also for being crap at designing buttons!)
GPS system (using mappoint2004 - note the gps satellite status above the exit button - also note the red circle; that is the nearest speed camera drawn from a database file)
using the on screen keyboard to enter an address
routing to that address
OBD2 screen still very primitive but showing a few dials that arent really connected up yet!