Online psychometric testing company AptiQuant, based out of Canada has done to show that dumb people are more likely to use Internet Explorer than smart people. The study found that the average IQ scores presented for users of Internet Explorer versions 6 through 9 were all lower than the IQ scores recorded for Firefox, Chrome, Safari, Camino, and Opera users.
Apple has approved four third party browsers (Edge Browser, Incognito, WebMate: Tabbed Browser, and Shaking Web) and they are now on iTunes Store. Apple seems to be relaxing their policy against apps that compete with their own apps.
The catch here is that all four browsers are Safari webkit based so you will not see Opera or Firefox anytime soon.