Recently, when I was preparing to bid adieu to an old computer (checking to make sure that it did not have any files on it that I might regret deleting), I came across a folder of old invoices dating from 1995. I paused nostalgically to see just what kind of work I was billing for so long ago and (alas!) how little I was charging for it.
What was I billing for in 1995 -- search engine marketing? The invoice was for keyword selection, META tag development and submissions. Yipes!
Little did I know at the time that 11, almost 12 years later I would still be doing SEO. The tools, tactics and search engines have changed, but goal is the same -- making sites visible on search engines. Who knows what the next 10+ years will bring.