Experian Hitwise report Bing increased its share of the U.S. search engine market by 5% in February. Yahoo! Search, powered by Bing, increased its market share by 3%, meaning the combined increase for Bing powered searching was 4%.
Google saw its share fall by 2% but is still, by far, the most popular search engine with 66.69% of all U.S. searches.
The Experian Hitwise press release is available from the source link.
Source: Experian Hitwise — Bing.com searches increase 5 percent in February 2011