Anonymouse.org is a useful website to surf internet anonymously. For Firefox users, there is a cool add-on for this site, which can be installed from AMO. This add-on creates an entry in right click menu to open links via Anonymouse.org.

Anonymouse.org is a fast, safe and easy way to protect your privacy online. It offers basic service for free. This add-on provides the easiest way to use the service.
Note: Unfortunately, Anonymouse.org pushes adverts and you may see annoying ads on web pages. But, is it a problem for Firefox users?? Absolutely not! Use Adblock Plus. ;)
Link: Anonymouse.org 1.0 (Firefox Add-on)
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Pingback: Chad's News – The Benefits of Internet Proxies
Anonymouse SSL is not free — only non-SSL, so you’re still getting the proxy anyway. Basically you are anonymous to the Website you visit and anyone legally requesting traffic logs from them, but you are not anonymous to anyone intercepting (sniffing) the traffic between the Website and you. I believe they could see your IP address this way.