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"Alarming for some investors was a slowdown in the rate at which ads are clicked on. That's important because Google's income from advertising hinges in part on how often Web surfers click on ads. Google said paid clicks increased 30% from a year earlier, compared with a 45% increase in the fourth quarter of 2006. Schmidt said the company has been reducing the clickable area around ads to decrease the number of accidental clicks, thus making the ads more valuable to marketers."
The full article is here
So the clickable are is affecting google bottom line :)