Using a standard keyless remote is high-tech enough for most of us, but if you're into total car automation you should take a look at the ProStar Car Alarm Remote. Not only does it have one-touch lock/unlock, there's proximity lock/unlock, cabin temperature checking, sensors for doors/hood/trunk, timed engine start, driver alerts, window PIN lock/unlock and a siren alarm.
And if you're more into the Knight Rider scene, there's also a watch that has a lot of the same functionality. Be prepared to plunk down $285 for the
KITT kit and another $50 for the watch, but who can put a price on being Michael Knight? Now all that's left is for Tom Tom to get William Daniels to do some GPS voices.