Every wonder what you could learn about pay per click by studying over a billion dollars in adword spending? Well, Larry Kim over at SEOMoz has done exactly that.

Curious to what industry spends the most in AdWords? Want to know some of the most effective tactics are in the Display Network? Read more in his article below.

http://www.seomoz.org/blog/5-killer-seo-insights-from-analyzing-a-billion-dollars-in-AdWords-spend