At their conference in Oxford, the OpenNet Initiative have released the results from their first global Internet filtering survey. This announcement has been widely covered in the media.
Out of the 41 countries surveyed, 25 were found to impose filtering, though the topics blocked and extent of blocking varies dramatically.
Results can be seen on the filtering map and an URL checker. The full report, including detailed country and region summaries, will be published in the book “Access Denied: The Practice and Policy of Global Internet Filtering“.