I dunno if this works, but I found it on the internet earlier.

Sit in the car with the door closed. Hold the remote in your left hand and the key in your right hand. Turn the ignition on (don’t start the car). Press the lock button (don’t hold the button, you must push it once then let go) on the remote. Turn off the ignition (do not remove the key). You have to repeat this process four times. On the fourth time that you turn on the ignition and press the lock button you will hear the door locks cycle. The car is now in programming mode. Leave the ignition on and now all you need to do is press the lock button for all the remotes you wish to program.

 

I remember another post about this earlier. Never got a confirmation on it. And if it "works with up to 4 cars?!?!?" The last part sounds a little far fetched, but would be a very nice feature for me...

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2001 Satin Silver w/ Nav
WW Spoiler - 20% Tint- Mud Guards - Full Nose Mask