Using google as a proxy

How to use google as a great proxy? Don’t find a IP proxy or web-proxy anymore. Leave it. Just use google as your proxy. Yeah, google. A search engine you used everytime, everyday, everywhere. OK, let me to the point.
To use google as a proxy, use this address http://www.google.com/xhtml or www.google.com/gwt/n. With this address, you will get proxied and simplified web you’d like, also may allow you to surf anonymously.But sometimes with this way you will be able to surf anonymous and sometimes may not. May bybass firewall may not. :)