It's not always easy selling SEO to the boss set on tightening the purse strings. Once in a while you get the naysayers who think SEO doesn't work. Well, Lee Odden has compiled a list of stats that will arm you when you require ammunition. He realizes no industry is perfect, but writes that it's clear SEO has become a powerful marketing channel. The stats he provides range from a poll on the top digital marketing tactics, to eMarketer and SEMPO data.