What is Search Engine Optimization (also known as SEO)? A broad definition is that search engine optimization is the art and science of making web pages attractive to search engines. More narrowly, SEO seeks to tweak particular factors known to affect search engine standing to make certain pages more attractive to search engines than other web pages that are vying for the same keywords or keyword phrases.
Sure, we did keyword research, we recommended partnerships and widgets and architecture advice, but we didn’t step back and take a good look at our target audiences, what sites were meeting their specific needs in search results, and what we specifically could build into the product that would be far more desirable than what everyone else had (not even thought of yet ideally) to make sure our entire site is superior, resulting in the inevitable stealing of search traffic from our competitors.

Nice work Laura! This is going to be a great series. I'm working my way through SEOmoz's Advanced SEO Training Series (videos) Vol. 1 & 2 to build upon the advice and guidance that you and your team provided to me during my time at Yahoo!. Now many others will benefit from your knowledge, experience and passion for SEO strategy and tactics. Best wishes for great success in your new role.