Many WirelessCommunities around the world use mailing lists. A few in the North West also use WikiWikiWeb to collaborate on documentation. Here's a list of many wireless mailing and community mailing lists. There's also a PersonalTelco MailingList.
Ashland's Wireless Internet Project
melbwireless @ melbwireless.dyndns.org Info/Subscribe/Archives
Consume the Net
Last I checked all the archives were very out of data ...
consume-resources @ lists.consume.net Subscribe
PublicAirport is for Apple Airport users to discuss public access to personal Base Stations.
To Subscribe Send e-mail to [firstname.lastname@example.org] with the text "subscribe" in the body.
Info on all of their lists.
announce @ seattlewireless.net Subscribe
Twin Cities Linux User's Group
http://www.tcwug.org is a new User's Group in the Minneapolis/St. Paul area. Started by a couple members of the local Linux User's Group.