Check out "Documenting Tools for Beating Internet Censorship" on the EFF blog.
Network censorship and surveillance is a booming business. Censorship schemes continue to fragment the Internet and new censorship proposals are constantly introduced around the world, including in liberal democracies. (Lately governments have gotten fascinated by the idea of forcing ISPs to censor particular sites from the DNS, so users can't find them even though the sites are still there.) Censors usually assume that most Internet users don't know how to bypass the censorship (or, often, that many users won't even realize the censorship is going on!).
Read more at www.eff.org
Unfortunately, the censors are often right, at least in broad strokes: many Internet users get used to censorship and rarely or never try to bypass it. And censorship doesn't always take the form of simply blocking sites and services. But there are still major efforts to beat technical censorship by technical means, and motivated users can generally take advantage of them. Millions of people are at least occasional users of censorship circumvention services, but it's a perennial challenge to broaden this pool and give people the tools to maintain uncensored access over time.