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The following report shows websites for the industry “Computers and Internet – Search Engines”, ranked by Visits for the week ending November 28, 2009.

In October 2009, Americans conducted 14.3 billion core searches, with Google Sites accounting for 65.4 percent search market share, up from 64.9 percent in September. Microsoft Sites grabbed 9.9 percent market share, up 0.5 percentage points versus September.
October 2009 U.S. Core Search Rankings
Google Sites led the U.S. core search market in October with 65.4 [...]

Experian Hitwise announced today that Google accounted for 70.60 percent of all U.S. searches conducted in the four weeks ending Oct. 31, 2009. Yahoo! Search, Bing and Ask.com received 16.14 percent, 9.57 percent and 2.62 percent, respectively. The remaining 52 search engines in the Hitwise Search Engine Analysis Tool accounted for 1.10 percent of [...]

comScore today released a preliminary study of the performance of Bing, Microsoft’s new search engine, during the first week of its public launch. The results of the analysis show a substantial improvement in Microsoft’s position in the search market in the days following Bing’s introduction.
Microsoft Sites increased its average daily penetration among U.S. searchers [...]

The following report shows search engines for the industry, All Categories, ranked by Volume of Searches for the 4 weeks ending May 2, 2009.

Source Hitwise