Starpoint, one of the wireless hackers on the NetStumbler Forums posted this last night, and I thought it might be of interest here.
Originally posted by Starpoint
READ THIS!!! add a normal wardriving laptop and run a script to post your files every so often!!!

CarWars
My reaction was a bit more into the security side of things, and :

Originally posted by Thorn
Alternatively, if the WiFi is hooked into the OBC network, this could be the next script kiddie attack where they run the Peugeot Pwnage script, and lock up the braking system. :p
It did get me wondering though, in all seriousness, whether anyone has tried messing around with OpenOtto? It's a OBC interface, and can be found here. Tiffany Rad, one of the project leaders, did a Skytalk. Did anyone see it?