Bonfire of Liberties
Stylishly presented, visually stunning history of book suppression and "dangerous books", with details about why they were banned.

Campaign Against Censorship of the Net in Britain
Details on government policy, White Papers to download, a database of MPs to badger, and links to other anti-censorship sites and resources.

Index Online
Web presence of Index magazine, with articles, diaries, interviews, dissident voices and coverage of net freedom issues, plus a cartoon gallery of censored cartoonists and a country-by-country index of censorship.

Pen Freedom to Write
History and current projects of the organisation that works to protect the written word from censorship.

In their own voices
"Dissidents speak in their own words": an up-to-the-minute site that disseminates work by authors censored by the regimes they live under. Part of the Digital Freedom Network.