Hat tip to Bill on this one, a good source of overview information that shows the size of the internet advertising business. “Clickz”:http://www.clickz.com/showPage.html?page=3630011 which is mainly from Neilson Online (really “Netratings”:http://www.netratings.com/). Some tidbits: * Web Media (what ever that is?) is largest at 74B impressions per month* Financial services is the largest segment I understand […]