g1smd - 6:47 pm on Sep 23, 2005 (gmt 0)

Beware of a 301 redirect from non-www to www where the defaultsitename is domain.com and where you are linking to a folder, and where you forget to add the trailing / to the URL in the link.

If you forget the trailing / then your link to www.domain.com/folder will first be redirected to domain.com/folder/ {without www!} before arriving at the required www.domain.com/folder/ page.

The intermediate step, at domain.com/folder/ will kill your listings. Lucklily, this effect is very easy to see if you use Xenu LinkSleuth to check your site: it shows up as reporting double the number of pages (when you generate the sitemap) that you actually have, with half of the pages having a title of "301 Moved".