The way SEOs conduct search engine optimization is changing all the time. The future of a large portion of search engine optimization is really just good usability, accessibility, development, design, information architecture, and marketing. All those measures are going to lead to one thing: developing a quality site that gets users to visit, read, bookmark, act, and come back for more.
Search engines like Google, Yahoo!, and MSN will start observing how users behave on your Website to add to a hidden trust rank score, similar to a page rank score. Google already has the tools in place to observe this data through Google Toolbar, Google Desktop, Google Analytics, and sites that have registered XML sitemaps with their Google accounts. With these kind of tools Google can measure how many people visit your site, what pages they land on, how long they stay, what they click on, what they book mark, form submissions, etc. This data is invaluable in calculating the authorative value and trustability of a Website. Once this information is collected it can be used in their algorithm to give further trust rank to Websites and thus boost their SERPs.
There are two approaches to this for whatever hat you wear. Whitehat SEOs will have to make better quality sites and focus on user retention and driving calls to action. Blackhat SEOs will figure out some methodology of fake user-surfing emulation. Either way, itís time to start preparing for the inevitable.