bumpski - 10:49 am on Mar 21, 2009 (gmt 0)

Return a 404 in the response header and show your site map page as the content. In fact make sure you return a 404; redirecting to your sitemap page and returning a 200 is a big mistake.

It's the perfect use of a well designed site map page. And your visitor sees one more of your site's well designed pages (and ads).

Then your user can "text search" your site map page if need be to find the page they truly want.