Internet Explorer is still the most preferred and most used browser; but it now has very strong competition from Firefox and Safari. While the Norwegian Opera hasn't advanced much through the years, Mozilla Firefox and Apple's Safari, have greatly developed and improved. Firefox now provides the most powerful and most user friendly browser on the Web. And Apple's Safari seems to be the fastest and gives the most vivid and 'most elegant' interface.
If you haven't tried Firefox: give it's latest release a try. And why not try Safari; if you haven't.