China Channel Firefox Add-on
The China Channel Firefox add-on was developed by Aram Bartholl, Evan Roth and Tobias Leingruber. It allows users to browse the web as if in China--i.e., experience mainland China's internet censorship. The add-on's authors say:
Unlike many tools which enable Chinese people to freely surf the web via connections to computers outside of China, this plugin routes all internet traffic to computers on the inside of the Chinese firewall, allowing web surfers to experience an Internet identical to that of Chinese.
For the most part the Chinese web will feel a lot like home. You will, however, begin to notices differences if you start asking Google about sensitive issues (for example Tananmen Square protests, or Pro Tibetan issues).