Each organic search engine ranking places emphasis on variable factors such as the design and layout, keyword density and the number of relevant sites linking to it. Search engines constantly update and refine their ranking algorithms in order to index the most relevant sites. Other variables that have an impact on search engine placement include the following:
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.