Saul Hansell from the New York Times reports, that “Google acknowledges that it is now testing ways to use some of the data it has been gathering to better aim search ads at Web surfers, although it won’t say how.”

This small change in Google’s behavior was first discovered by Gene Munster, an analyst at Piper Jaffray, who earlier this year started a series of tests looking at which ads were displayed in a series of queries on Google’s search engine. He found that the ads you see on one search may be influenced by what you searched for a few minutes ago. Search for “Baltimore dining,” then something else, and then “T-shirt” and sometimes you will get ads for T-shirts from Baltimore restaurants.

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