A leading proxy system for privately surfing - not saying you'd need this. Tor is a registered 501(c)(3) nonprofit with the purpose of protecting your INternet traffic from analysis.
The great firewall of china comes to the US via Bing. It looks like Bing is filtering Chinese language searches in the US to match more what someone would see INSIDE China. This is pretty disturbing but also points to the challenges of creating different "filters" by country and also knowing where people are coming from (due to the use of proxies.)