Originally Posted by Hardlinks

And this IS a problem, the search engines follow those links throughout the page as you add links ..ie /pagea.html so the bot follows http://domain.com/pagea.php and all the rest and caches and indexes them, sounds good but its not.

On Google this may be enough to convince them that your domain is full of duplicate pages. Use the rewrites to send them all to 1 of the two, but i think natural linking mostly happens with the www. so i use it.