Recently a client asked about adding a site map to his site, and while researching a bit more info I came across this article. It explains what a site map is and why you might need one , and how it's useful to your web site visitors. Page 2 is more technical but the rest of the article is great – very informative and easy to understand:

http://websitecleanup.com/go/356fb5

If you want a site map, just let us know… we're happy to help!