buckworks - 5:13 pm on Feb 9, 2011 (gmt 0)
If internal searches give you new ideas for content to put on the site, I'd count that as SEO.
I very much agree with Goodroi when he says "a strategy must be multi-faceted." Good SEO is seldom about one Magic Amazing Secret Technique, it's more about getting a gazillion details fine-tuned so they're pushing in the same direction.
I aim for validation but I give up when it comes to "illegal" characters within affiliate URLs!