As the US government looks into #Google from an antitrust context, a central question has to be what is their real search engine market share in the US? As someone who runs a search engine, I've followed and studied the numbers floating around for a while. And yet they've never really sat right with me.
Comscore and Hitwise are two primary providers of search engine market share numbers. Their two latest reports peg Google's share at around 65% in the US, and that's generally what the press reports.