Google Aims to Wrest Display Ads From Yahoo

Google is pushing for a second act. The company has built its fortune almost entirely on the back of small text ads, which appear alongside its search results and on sites across the Web. Now it is stepping up efforts to make inroads into graphical display ads, a business long dominated by Yahoo. On Friday, the company plans to introduce a long-awaited new version of an ad exchange, like a stock market, where advertisers and publishers can buy and sell advertising space, filling spots in Web pages on the fly.