I love this , so do the search engines . A sitemap allows easy navigation through your site and makes it easier for the seo robots to index it.
Again download it ,unzip ,upload to your plugins directory on your web server.
Activate the plugin from your plugin menu ,create a page called Sitemap and copy the following code into the page
Select your Sitemap page and your will see all your articles listed .Now thats what I call easy.Check out the SiteMap tab on this site.