Wow. Hitwise reports that "Google accounted for 68.29 percent of all U.S. searches in the four weeks ending May 31, 2008 .... Yahoo! Search, MSN Search and Ask.com each received 19.95, 5.89 and 4.23 percent respectively. The remaining 41 search engines in the Hitwise Search Engine Analysis Tool accounted for 1.63 percent of U.S. searches. ... Google search properties (Google.co.uk and Google.com) accounted for 87 percent of all UK searches in May 2008 representing a 12 percent increase compared to May 2007. Yahoo! search properties accounted for 4.09 percent of UK searches in May 2008, a 2 percent increase compared to April 2008. MSN search properties accounted for 3.72 percent and Ask search properties accounted for 3.07 percent of searches. MSN increased two percent compared to April 2008 and Ask increased 6 percent."
Hitwise's U.S. sample is 10 million; 8.4 million for the U.K.