Pricing tensions shake up Web display-ad market - WSJ.com

Growing tension between popular Web sites, such as Yahoo, MSNBC.com and History.com, and the middlemen who sell ad space for them is shaking up display advertising.

The market for online display ads -- those with text and pictures that border a Web page -- has dwindled amid the ad recession to an estimated $20.8 billion in 2009 from $23 billion in 2008...