A few good links
Critical Space Sites:
Global Network Against Weapons and Nuclear Power in Space - exhaustive information on space militarisation and other dastardly doings.
Association of Autonomous Astronauts - many of the AAA groups have websites. This link is probably the best starting point, with links to most of the others.
Mainstream Space Sites:
www.space.com - There are numerous websites with information on space - for a start all the major space agencies and corporations have sites. This is as good a starting point as any, with daily updated news and an extensive links listing.
Radical science fiction:
Feminist Science Fiction, Fantasy and Utopia
Science fiction after the future went away - essay on the state of SF by Ken MacLeod.
Communism etc.
For Communism - "Communism is a society without money, without a state, without property and without social classes" - links to lots of interesting sites and texts.
N + 1 - this (mainly) Italian language site includes the writings of the left communist Amadeo Bordiga on space. If anybody has the time to translate any of it, we would be happy to put it up on our site!
Practical History - radical history sister site to Red Giant.