I forgot to post some of the maps I generated from the trip I took down to Charlotte, two weeks ago. Here is a small collection of the maps I managed to create with Kismet's gpsmap utility.
I might note that something is funky with hostap, or possibly Gentoo's ebuild. Kismet failed to put my 200mW Prism2 card in monitor mode, and I wasn't able to do it via iwconfig, either. Unfortunately, it took me about 100 miles to figure this out, after seeing almost no networks pop up, in densely populated areas. It's too bad, because I had my external antenna setup fairly nicely for the trip. I switched back to the internal Atheros card, which channel hops through 2.4 and 5GHz frequencies. Unfortunately, I couldn't use my external antenna. I'm going to have to fix hostap, or compile it by hand like I have in the past. Oh well.