<? $pop = $wpdb->get_results(SELECT ID,post_title,comment_count FROM {$wpdb->prefix} posts WHERE post_type ='post' ODER BY comment_count DESC LIMIT 10 );
foreach($pop as $post) : ?>
<li> <?php echo $post->post_title; ?> </li>
<?php endforeach; ?>

pcfuori [WordPress] : Come contare i commenti dei Post