This is a remote car entry system which uses a RFID transponder to communicate with the car, telling it to unlock itself. This Civic went from manual locks to having power locks that think for themselves. Complete car security system, very cool. Complete How-To follows:
I was thinking of doing something like this, but I would make my design so that the doors would unlock when I got within 2-3 feet of the car. (no swiping a card over anything.)
I would also want to rig up a push button start/stop for the engine. The button would also be enabled when I was close to the car. (The steering wheel lock would require some modification for this.)
doing it this way, I could just walk up to my car get in, push a button, and off I go.