You know – people talk about how SEO isn’t one of those things you can do once and then reap the benefits forever (I say people, but I mean SEO professionals). We’ve talked about how search engines are constantly updating; it’s what they do. Spammers get more sophisticated, darn them; search engines have to evolve to combat spammers. Optimizers, marketers and site owners have to change to combat the evolution of the search engines. It’s a vicious, vicious circle.