Access Denied Map is a project to map and follow internet censorship with a focus on Web 2.0. There is a Google Maps mashup of countries which ban specific tools and sometimes links to groups which are helping others to bypass the censorship.
News stories are constantly updated about web censorship. For example, Syria has banned Facebook. Catholicgauze doubts the Baathists want to improve the efficiency of Syrian college students. (Hat tip: Reader Meegan via Google Maps Mania)