Hey Kate,

Unfortunately (embarassingly? naively?), I'm pretty oblivious to my surroundings; I've in my own little "zippy" world. (For example, I can walk right by someone I know in the store and not actually notice them unless they speak/tap me on the shoulder... )

Anywho, the only things that actually come to mind right now (and these were things that my best friend's brother-in-law (a state cop) told me) are:
*When you're walking to and from the parking lot, carry your keys in a fist and arrange it so that a key is sticking out between each finger. (Did that make sense?) The idea is that, if you have to throw a punch, the keys will aid (cut, scratch, gauge, etc) in your defense.
* Don't wear pony tails -- way too easy to grab!
* Park under lights and as close to the building as possible. Avoid parking by vehicles that are bigger than your's and/or obscure the line of vision to/from the store.

I know he mentioned a few others but I can't remember them right now.

Hope this helps a bit!