Here You’ll see links to some services that allow You to surf the Internet anonymously. They hide Your IP address, making unable to track from where have You come. Breaking thru corporative firewalls that blocking some sites also is possible with these services. Most anonymous services has limits for free users or shows their ads. So chose, if You need.

Anonymizer.com
You may use address like http://anon.free.anonymizer.com/http://www.yoursite.com.
Sometimes loaded pages seems broken.

BeHidden
There is a limit to 50 Mb of traffic for free user per day.

Proxify
Comfort. Allows to cut off ads, scripts, etc. Puts own ad on the top of the page. You may use address like http://proxify.com/u?http://www.yoursite.com.

@nonymouse
Free and fast. Puts own ad to the page.

Guardster
Free and fast. Allows to cut off ads, scripts, etc.

If it is not enough, see more here.