Google still number 1 while bing passes yahoo for the first time ever.
For the first time, MSN/Windows Live/Bing Search overtook Yahoo! as the #2 search engine in the U.S. with a 13.9% share of search volume in August 2010, a 0.25% delta increase from the previous month. Although Google saw little change in its month-over-month search volume, it still dominates the search market, accounting for 65% of all U.S. searches.
Read more at: http://blog.nielsen.com/nielsenwire/online_mobile/bing-overtakes-yahoo-as-the-2-search-engine/