anonymous web browsing???

I don't know if you can use it, but I believe Safari allows you to do "private browsing."

 

Safari's private browsing won't work, it only stops traces of your browsing session being left on the computer you're using.

I'm not sure if we're allowed to help you circumvent government restrictions, I'd have thought it's illegal in some way.

 

Safari's private browsing only stops web information from being stored on your own computer. No history, no cache, etc. It does not provide anonymous browsing in the sense that the OP wants. For that you have to go through a proxy server so that they go to the banned site and then relay that site to you. Obviously, that takes some work on the part of the proxy so it is no surprise that most of these services cost money.
Also, open proxy allow spammers to run their junk, so you will have to register with them.
http://www.the-cloak.com/
http://proxify.com/
Your mileage may vary depending on how sophisticated the ISP's are.