http://www.businessinsider.com/yahoo-spends-90965-per-day-on-google-ads-2009-6 http://www.businessinsider.com/yahoo-spends-90965-per-day-on... http://www.busin

http://www.businessinsider.com/yahoo-spends-90965-per-day-on-google-ads-2009-6 http://www.businessinsider.com/yahoo-spends-90965-per-day-on... http://www.businessinsider.com/top-100-google-advertisers-by-keyword-in-april-09 http://www.businessinsider.com/top-100-google-advertisers-by... That second link pre-dates Bing's launch, I believe. You'll see Yahoo and Ask.com in the top 15. Much of the top 20 are product, travel or local search engines.