Any expertised SEO webmaster knows that the only way to get free quality traffic to any website it's to rank well in search engines and directories, specially in Google, the secrets to achieve relevant search engine position are to get the site pages well indexed and linked to thousands of websites across the web retrieving thousands of backlinks, the many number of backlinks you have the more you will appear at the top of search results, good part of those backlinks come from directories like the one listed on the side. Link exchange.