Almost forgot: Adam pointed me to ArlingtonList, a community mailing list for residents of Arlington, MA. The site has instructions on joining the list, member bios, password-protected archives, and a wiki (which has since been turned off as it was underused and getting defaced). The site also features a reprint of a 2002 Boston Globe article about the list. It’s interesting. I may have to rethink some assumptions about the role of geography in building online communities.