Last week, Google rolled out a major change to its search engine's interface. American users, and some users in other countries, began to see the results for their Google searches appear onscreen while they were still typing. For example, if you type "b" into Google's search box, you might see the results of a Google search for "bank of america" appear below the box, along with a sponsored link from Bank of America. Keep typing until you have "bat" in the search box, and the results could suddenly change to match a search for "batman."