from http://www.everythingusb.com/mazda_sassou.html

Mazda Ditches Cylinder Locks in Favor of USB Key
By Scott Clark on Tuesday 30 August 2005, 8:24 PM

I never thought it'd be possible, but Mazda of all companies has embraced the inner geek inside me to make me want to run out and test drive one of their cars. Thankfully this is only a concept car for now, and my Honda is still running strong.

Designed for "net-savvy youngsters", Mazda's new concept hatchback, Sassou, ditches the traditional cylinder lock key system in favor of USB flash drives. In addition to starting the engine, the flash drives can be used to transfer driving directions for long trips along with the latest songs for the day to the Sassou's internal hard drive.

Just be sure to vent the windows though, it looks like the extra large sunroof would literally cook any electronics you have in the car during your lunch break.