• The Cyberpunk Project
  An archive of material including out-of-print cyberpunk fictions (such as Tom Maddox's "Halo")
• Mirrorshades Postmodern Archive
• EFF "Net Culture - Cyberpunk" Archive
• alt.cyberpunk Frequently Asked Questions list
• Cyberpunk from heretic's house of fun
• Cyberpunk radio
  Strange and interesting.
• Documents and other ephemera from the MindVox BBS/ISP
• Max Headroom
  Cyberpunk? Maybe not so much, but "the Max Headroom chronicles" site captures the zeitgeist of the era with a number of cyberpunk ideas and memes that were floating around in the '80s.

More to come. With categories and things. As time permits.