Net Applications apparently have a sample of 40,000 websites, whereas StatCounter have a sample of 3,000,000 [1]. StatCounter shows radically different numbers (e.g. Chrome by far the most used, whereas NA shows IE majority). IMO, StatCounter's numbers are more likely to be accurate.<p>[1] <a href="http://gs.statcounter.com/press/open-letter-ms" rel="nofollow">http://gs.statcounter.com/press/open-letter-ms</a>