404 Error on new pages outside wordPress pages

I just upgraded to WP1.5 and I had a number of separate pages that used files similar to the header and footer, which I have switched over to. Now, however, I get a 404 error on any non-blog or page.
Here is an example of the most basic attempt I made.

<?php
define(‘WP_USE_THEMES’, true);
require(‘./blog/wp-blog-header.php’);
?>

<?php get_header(); ?>

<div id=”content”>

</div>

<?php get_sidebar(); ?>

<?php get_footer(); ?>

Something is clearly wrong, but I don’t know what. This was happening with my previous header and footer so i transferred them to this new theme type header and footer in WP1.5 and I get the same result.