A joint venture between The Pirate Bay and Anonymous, The Persian Bay aims to be a reliable way of communication for Iranians and friends. It's basically a set of forums with titles like Keeping your Anonymity In Iran, News and Current Events, Protest Advice or Videos and Pictures. Even if you're not interested in first-hand reports of censorship and protest in the Middle East, the Anonymity Forum offers a good introduction to open source privacy- and security-software.
Fake-Edit: This sounds interesting: Protest In Iran Gear Recommendations And Preventive Measures. Could come in handy for any kind of protest.