In the past four weeks, Google has accounted for 66.69 percent of all US searches and Bing-powered searches accounted for 28.48 percent in that same period, according to Experian® Hitwise®.
The Big / Yahoo search market breakdown:
This data shows that Yahoo and Bing have received the biggest gains for February 2011. In this same period, long search queries decreased by 2% from January to February 2011, whereas one-word search queries increased by 2% for that same period.