This stuff doesn't have it's own section yet, but obviously some of it will soon...
Junkbusters a group advocating a "junk" free world. The Junk-buster proxy is a great idea, and the Anti-telemarketing Script is also pretty cool.
Really cool satirical look on the news. The Our Dumb Century book is fantastic, a very useful history lesson.
Critical Mass
Critical mass is a really cool cycling and anti-car activism group. The Sydney group's pages are cool, including a fascinating Fact Pack. I've made it to one ride in Melbourne and hope to do some more oneday.
Reclaim the Streets!
Similar to Critical Mass but a little more grand in their designs. I have one two links to some more information including a really cool article on the Social Ideology of the Motorcar.
Some very subversive graffitti that is all
too un-anonymous...