Here’s more from HitWise:
“Google accounted for 72.25 percent of all U.S. searches conducted in the four weeks ending Jan. 2, 2010. Yahoo! Search, Bing and Ask.com received 14.83 percent, 8.92 percent and 2.54 percent, respectively. The remaining 66 search engines in the Hitwise Search Engine Analysis Tool accounted for 1.48 percent of U.S. searches.”