You can use the code on the site you linked to with post thumbnails, if you change one line.
Instead of
<img src="https://wordpress.stackexchange.com/questions/26484/<?php echo get_post_meta($post->ID,"thumb', true) ?>" alt="<?php the_title(); ?>" />
Use
<?php the_post_thumbnail(); ?>
See the Codex for more information.
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