hey saveahoe,
from one bay area resident (I live in Foster City) to another, I'll make sure to keep an eye out. I am anal about where I park my car--people insist that I am just anal, but stories like this prove to me that parking out of the way and keeping an eye on the car, if possible, is always a good idea. It also proves to me that Texas and Florida's "Deadly Force to Protect Personal Property" law is long overdue for the Governator to introduce here.
I keep a club anti-theft thing in my backseat--besides being a visual deterrent (when I actually use it), it also makes a very good beating stick.
I can't believe no one saw anything, or at least couldn't take a down a license plate. When I have seen someone do something like this, I always take pictures or confront them. Camera phones are great for this sort of thing.
A good story in the same vein--in college in NYC, we'd all park in the street (obviously). A roommate went outside one morning to find two huge gashes in his rear bumper--at least an inch deep each. He looked, and the guy who parked behind him had a huge brush guard on this truck. The gashes lined up perfectly with the car in height and distance--it was obviously the guilty party. The idiot had not only not left a note, but didn't drive away to cover his tracks. This was not an 'oops--i guess i was a little closer than I thought' bump--this was a good 15-20 MPH hit.
So, what do a few 20 year old's do? Well, we figured the brush guard was a risk to other drivers, so we proceeded to disassemble it (as an effort to increase public safety and welfare, of course), and leave the pieces on the offenders hood. I am sure he/she was not happy when they found their truck slightly disassembled, and probably even more unhappy with the scratches that the pieces undoubtably made.
Good luck with the repair. I'll keep the beating stick warm for the next offender.