"If you want the search engines to rank your site, you also have to make sure you have a complete site map that has your primary keywords. You want the search engine spiders to be able to find all the pages on your site with no difficulties, and your site map makes this possible. Your site map is a clearly laid out route for the search engines to find directions and to know more about your site. Site maps are one of the most fundamental tools of SEO, so make sure your site has one. If you're wondering how large your site should be for SEO purposes, this is something on which even SEO experts disagree. Some people will tell you that a larger site will tend to rank better, but on the other hand some webmasters manage to rank well with smaller sites as well."