Site Map Builder .NET 

Site Map Builder allows you to create the Google SiteMaps XML needed within your root directory in order to provide information about your site to Google. This XML must have some syntax that SiteMapBuilder.NET will generate for you
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CoffeeCup Google SiteMapper 

By placing a Sitemap-formatted file on your webserver, you enable the Google crawlers to find out what pages are present and which have recently changed, and to crawl your site accordingly.
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