SEO Tip #10 - Google Sitemp

Google sitemap is Google's way to know your site better. This is an xml file that can be created without any knowledge in xml and can be generate easily with any sitemap generator, I use to http://www.xml-sitemaps. Most of the services are free of charge.
The site map will help the spiders to crawl to your entire site's page and by that to index all pages. This sitemap protocol was developed in response to the increasing size, complexity and pages multiplicity of websites.
Each sitemap include four parameters for each page:
URL of a page, changing frequency (daily, weekly, always etc), Last modification
And Priority.More Details here