This application from CGIProxy allows one to browse a site anonymously. By using this, one is bypassing any possibility that they are being monitored by their workplace, library, ... Anonymizer and SafeWeb do the same thing though charge a fee.
You will be asked to accept a security certificate. This is secure, just not something I paid for.
To use this you will have to enter a valid Username and Password*.

* Sorry, due to bandwidth restrictions with my provider, I can't provide for the world.