You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Why Ad Exchanges Are Picking Up Steam Again Finally, Yahoo's Right Media, Google's Doubleclick and Even Some Small Indies Get Set to Shake Up Market By Rich Karpinski, Published on April 20, 2009 3 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.