One thing that I have found that works better than any program is to have a seperate user account just for browsing the unknown. If I'm just going to literally browse, I log off and switch to that account. If I get hit, I shut down and boot to my own account and delete the browser account. Works like a charm. Done it twice now in the past year or so.
I use my Linux box for that, with Firefox. When I'm done, I clear all private data.