For instance, of No. 9 on the list, ignoring non-Google search sngines, he writes, "Why limit yourself to Google!? Just because they're the market leader doesn't mean that another 15-20% of search traffic from Yahoo!, MSN & Ask isn't worthwhile. Most people salivate at boosting SEO 15-20% but continue to ignore the other engines. As a first step, at least register with Live Webmaster Tools and Yahoo! Site Explorer and send them your sitemap."