I have the RSX 3.5, with all the extra's (hopefully upgrading to the G5 Soon). I got the idea from a friend of mine who rigged his house up in the same manner. I talked it over with my sound shop. They also do custom alarms and they came up with a way to configure a camera like one of these:

http://www.spycentre.com/mini_camers.htm

To automatically take snap hots ever 3 seconds, then send them to my cell phone through my car's internet connection.

I spent nearly $5000 on the damn thing. I have had my car broken into 4 times, nothing has ever been lost, except two rear quarterpanel windows and some paint, all 4 times they got into the car. All 4 times they were defeated by
A : my kill switch
B: my diligence at removing the face of my head unit.

After all, the thieves had no idea they were getting photographed