The best I've seen for the masses
http://icloak.me/
ICLOAK lives only in the part of the memory that gets erased every time you tun off your computer. Turn your computer off, start it normally and nothing that you did has been saved, unless you want it saved. Because we don’t access your hard drive ever, ICLOAK can never be infected by the nasty programs hackers use to violate your privacy, steal your passwords or compromise your identity.
There are plenty of schemes that purport to make you anonymous or "untraceable" on the internet. The most misunderstood is "incognito" mode on a browser.
Sorry, but if the hard drive is active, you are easy prey to hackers and criminals who would do you harm.
All of these methods solve only part of the problem. ICLOAK solves them all.