The Electronic Frontier Foundation has just published "Surveillance Self-Defense International: 6 Ideas For Those Needing Defensive Technology to Protect Free Speech from Authoritarian Regimes and 4 Ways the Rest of Us Can Help."
Here's a snip from the introduction:
The Internet remains one of the most powerful means ever created to give voice to repressed people around the world. Unfortunately, new technologies have also given authoritarian regimes new means to identify and retaliate against those who speak out despite censorship and surveillance. Below are six basic ideas for those attempting to speak without falling victim to authoritarian surveillance and censorship, and four ideas for the rest of us who want to help support them.
The document is also available as a PDF.