Crap. It did it again today, while I was driving down to visit my friend in Charlottesville, VA. Drove about 400 miles with no problem, then all of a sudden it died. (This was the first time it had ever done this while going at highway speeds.)
Anyway, this time I tried swapping out both the fuel pump relay and fuel pump fuse; no luck. After about 15 minutes, it started up fine and I drove off-- only to have it die 10 miles later. I got fed up and had it towed to a shop in Charlottesville-- I'm gonna have them take a look tomorrow and see if they can come up with anything.
Grrrr. At least I've succeeded in trying, and eliminating, one possibility.
--afn
