Well, I found this one. It was the parking brake cable squeaking in the grommet where it goes through the floor. I was on my way home from work, and the thought occured to me to push down on the parking brake. As soon as I did, the noise stopped. I just about jizzed my pants.
I pulled off the sill panel and the kick panel, and just by feeling around, figured the exact source. One shot of lithium grease in between the cable and the grommet...problem solved.
One down, several more to go!
