when sitemap generates the page is includes accesskeys, so for example in my site menu I have a menu item called home linking to accesskey 1, and this is listed twice on the sitemap page that is created, once in the menu and once in the page content. This makes it fail validation on some testing sites, but not others, I don't think it's actually an accessibility issue as the access key is not conflicting (it's the same key).. but never the less as my sites primary concern is fixing the web's accessibility problems I'm getting picked up on it by my users who don't know it's not a real issue.

Ben from Fix the Web http://www.fixtheweb.net