Download Torpark and browse the internet anonymously by connecting via the TOR Network. Your true IP address is not displayed to the server.

Its based on the portable version of Firefox and can be run from a USB Drive without any traces of installation on the system where you intend to run it on. Regarding privacy at the exit servers, I could not come up with information on that at the site. Except that the Creator, Steve Topletz supports privacy!

And yeah, its free. :-) Download it from here.