The Shmoo Group is building GAWD, the Global Access Wireless Database. While not an actual wireless community group, the service they provide is very interesting. Their tool lets wireless providers and groups list the physical location and capabilities of their access points. The data is then searchable by provider, location, or even latitude/longitude. As I write this, they have 211 APs listed online. You can check out GAWD (and list your own node) at http://www.shmoo.com/gawd/.