As I mentioned in Post 10: The SEO Plan, this post is the second in a 4-part series on SEO written by guest author Shawn Livengood who runs the blog ppcwithoutpity.com. If you haven't already, check out Part 1: Getting Indexed. And after you finish reading this post, have a look at the code changes for this post in GitHub to see Shawn's suggestions at work on this site, as well as some html tag changes to move towards cleaner, semantic markup.