Two I came across today are:
Shmoo group GAWD (Global Access Wireless Database): http://www.shmoo.com/gawd/ (not working at the moment)
Netstumber HotSpot database: http://hotspots.netstumbler.com/def
Some info on local WiFi, some hotspots, some open access points that I dug up for that LJ community thread I linked above:
x-posed to wireless & wardrivers
So, any suggestions? Are anyone still uploading their wardriving results?