The Open Guide to London: the free London guide

There are plenty of sites about London on the Web. Where on the wider net do London communities also exist?

IRC

Undernet:

• #london: general London channel (site)

irc.perl.org:

• #london.pm: channel for the London Perl Mongers
• #OpenGuides: Although not exclusively London, you can chat with other contributors, site admins and developers here

Usenet

• uk.local.london

Mailing Lists

• London groups at Yahoo! Groups
• Freecycle London
• London by London (is this a community, or is it really one-way?)