Creating SitemapsBy Charles Heflin (c) 2006
Submitting your sitemap to Google and Yahoo is the next best step after your site is listed with the directories and been made ready for human visitors. Adding a sitemap to your website also helps users to quickly find information that they are looking for.
Submitting your sitemap to Google and Yahoo will also let them know that you need some crawling and indexing action. Google's sitemap feature allows you to specify how often you make updates and this will prompt their robot to visit your site more frequently to index your new pages.
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Getting Into Google and Yahoo News
Hidden Content Sources