Search Engine Watch offer a great read about latest market shares of all 3 major search engines, have a look at the graphic below:

“…Bing, the company the powers Yahoo’s organic search results, continued its incremental growth for the second straight month. At 15.3 percent, Bing grabbed its highest search engine share since launching in 2009, topping its previous high of 15.2 percent, set in January.

Bing became the number two U.S. search engine in the U.S. when it surpassed Yahoo for the first time in December 2011. In February 2011, Bing’s search market share was 13.6 percent.

Least surprisingly of all, Google continued to lead the U.S. search market, with 66.4 percent, up from 66.2 percent in January. Google commanded 65.5 percent of the search engine market last February…”

Source: Infographic by Neil Tweddle/Search Engine Watch