Reporters without Borders has publishes the Internet Enemies 2012 Report http://march12.rsf.org/en/#ccenemies This provides rankings and information on nations that censor internet access.
Other useful sites on this topic:
The Ifex international Freedom of Expression Exchange http://www.ifex.org/ is a good starting point; it aims to rapidly disseminate news and information about freedom of expression violations around the world. These include internet censorship. Links are often provided to the latest reports.
Freedom House has programmes assessing internet regulation and freedom worldwide. http://www.freedomhouse.org/issues/internet-freedom
Herdictweb is a project of Berkman Center for Internet & Society at Harvard University. It uses citizen reports to map and monitor inaccessible/ blocked sites. http://www.herdict.org/
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