Ron Deibert, Director of the Citizen Lab recently gave a Policy@Google Talk on December 8th 2009 at Google headquarters in Mountain View, CA.
The talk was an overview of Internet censorship patterns worldwide, with a focus on the work of the OpenNet Initiative and some references to challenges around circumvention technologies.
Watch it here from YouTube
http://deibert.citizenlab.org/blog/_archives/2009/12/14/4404498.html