Ive thought about this too. I always take my DSLR with me everywhere I go, and wory about leaving it in the car. Although adequate insurance covers it, I still wouldnt want it getting stolen.
So Ive been thinking about getting a bridge camera similar to what I used when I first started flirting with photography. Had a Fujifilm Finepix bridge camera (cannot remember the model number), better than using a compact in some respects, and good enough to get some decent creative shots with some of the controls I now get with using a DSLR.
I could keep one of those in my car with my old tripod without worrying as much when keeping my DSLR in there and still get the ability to have some control over Aperature, Exposure ect.