So that search engine spiders are able to navigate
their way throughout your website easily, indexing
all of your pages successfully.
Each time you update your website, you should
resubmit your site map so that it’s updated and
includes all of your main pages, as well as your
sub pages.
Sitemap Generators:
http://www.Google.com/webmasters/sitemaps
http://www.sitemapdoc.com/
http://www.xml-sitemaps.com
http://sitemap.xmlecho.org/sitemap/
Once you have your website pages optimized and
ready to submit to the search engines, you can hire
a submission service, like the one featured at:
http://www.submitcentre.com/ or do it manually by
visiting each of the major search engines.
Helpful Tip: There are a few free tools out there that will enable you to automatically create and update sitemap files for your website. One of these can be found at http://www.gsitecrawler.com