It was some time back that Google had more than 65% market share. But because of it's complicated algorithms many of the
website hostings don't appear in Google but in Yahoo and MSN. So now most of the traffic is diverted towards these other search engines. Eventually the traffic from Google is decreasing bit by bit. It will not be surprising to see if it is 40% today, as written by Jack. I am also interested to know the details. Anybody has more info on this?