China and Google.
a fascinating Times magazine piece.

If you search for "Tibet" or "Falun Gong" most anywhere in the world on google.com, you'll find thousands of blog entries, news items and chat rooms on Chinese repression. Do the same search inside China on google.cn, and most, if not all, of these links will be gone. Google will have erased them completely.

...

There are three main fiber-optic pipelines in China, giant underground cables that provide Internet access for the public and connect China to the rest of the Internet outside its borders. The Chinese government requires the private-sector companies that run these fiber-optic networks to specially configure "router" switches at the edge of the network, where signals cross into foreign countries. These routers — some of which are made by Cisco Systems, an American firm — serve as China's new censors.