Creating and submitting Sitemaps
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from: http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=156184
Creating and submitting Sitemaps
About Sitemaps
Sitemaps are a way to tell Google about pages on your site we might not otherwise discover. In its simplest terms, a XML Sitemap—usually called Sitemap, with a capital S—is a list of the pages on your website. Creating and submitting a Sitemap helps make sure that Google knows about all the pages on your site, including URLs that may not be discoverable by Google's [ ... ]