http://www.google.com/chrome
it acts a lot like firefox with tabs and stuff, but it is built different from the ground up. nothing like it has existed yet, so the spammers/scammers/people who wish you harm have not had a chance to start writing for it yet. not only that, but i believe the architecture to be so different than IE or firefox that the types of malware out there couldn't even be translated to affect chrome. it's the latest, and i think, the greatest browser around. i browse with no fear at all about any of the sites i normally wouldn't think of going to with IE.