Google is starting to look at the history of what its users search for in deciding which ads to show them. It's a small step, but significant since Google until now has said it doesn't use its vast store of information on the behavior of its users to target ads. <a href="http://bits.blogs.nytimes.com/2008/06/26/google-tests-using-your-search-data-to-tailor-ads-to-you/">Read more...</a>