The CPB is blocked in Iran. For that and other reasons, I’m pasting in the list I created there of links to proxies and other tools that you can use to reach, read and post to the Internet. These tools allow the user to do things like circumvent filters and anonymize sessions. Please read the materials at each site to understand what the tool does and remember that nothing is fool-proof.

Safer blogging tools

Access Flickr plugin
Al Kasir
Global Internet Freedom Consortium Solutions
Peacefire’s Circumventor
Proxy Servers
Tor onion routers

Safer Blogging Guides

BlogSafer
Chnblggr
Everyone’s Guide to Bypassing Internet Censorship
Global Voices Anonymous Blogging Guide
Guide to Facebook Activism