Google Sitemaps

[microbe]

"Google Sitemaps is intended for all web site owners, from those with a single web page to companies with millions of ever-changing pages. If any of the following are true, then you may be especially interested in Google Sitemaps:

* You want Google to crawl more of your web pages.
* You want to be able to tell Google when content on your site changes. "

http://www.google.com/webmasters/sitemaps/