The most used browsers are Internet Explorer, Firefox, Safari and Chrome. Opera is under 2% and others (hello Netscape) less than 1/2%.
The actual percentages for visitors vary greatly depending on the type of business you are in.
Here are numbers for November, from Hitslink:
Internet Explorer, all versions: 58%. For FastF.com, the total is only 38%. 6% are still on IE6 (2% for our visitors).
Firefox, 21%. For our visitors, 31%
Safari, 8%, for FastF, 16%.
Chrome, 7%, for FastF, 10%
Clearly the big loser continues to be Internet Explorer, which once completely dominated. The big visitor this year is really Chrome, which has tripled market share and no sign of slowing down.
That also does not bode well for Bing, since a lot of their market share of Search comes from the fact that it is the default search engine (of course) for Internet Explorer.
I predict this trend will continue, that by end of 2011, IE will have less than 50% market share. But since I don’t see any of the three Safari, Chrome, or Firefox dominating the others, there’s no clear path to any new winner in the browser wars, not anytime soon.