I previously mentioned the excellent new book, "Access Denied: The Practice and Policy of Global Internet Filtering," which is edited by Ronald J. Deibert, John G. Palfrey, Rafal Rohozinski, and Jonathan Zittrain. It is a comprehensive survey of the methods governments are using to stifle online expression. The contributors provide a regional and country-by-country overview of the global state of online speech controls and discuss the long-term ramifications of increasing government filtering of online networks.
Business Week has just posted an interview with one of the editors of the book, John Palfrey, executive director of the Harvard Law School's Berkman Center for Internet & Society. John provides a nice overview of the major themes and issues covered in the book. But make sure you pick up the entire volume. It's an important resource to have on your bookshelf.