Google and Yahoo's nearly 90 percent share of all search queries is impressive. Google and Yahoo's share of money spent on actual search advertising is yet more so. Efficient Frontier reports that in the second quarter 2008, 95.2 percent of all money spent on search advertising went to Google and Yahoo — 77.4 percent to Google and 17.8 percent to Yahoo. Only 4.8 percent of all money spent on search went to Microsoft. "Google and Yahoo will remain fierce competitors," Google's top lawyer David Drummond told lawmakers earlier this week, trying to convince them Yahoo's plan to outsource its search advertising to Google won't give Google too much power. "This agreement will not remove a competitor from the field."

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