Simply paste the following code where you want to display your most popular posts to be displayed:
$pop = $wpdb->get_results("SELECT id, post_title, comment_count FROM {$wpdb->prefix}posts WHERE post_type='post' ORDER BY comment_count DESC LIMIT 10");
<ul>
foreach($pop as $post) : ?>
<li> <?php echo $post->post_title; ?> </li>
<?php endforeach; ?>
</ul>
Thanks to Neil Skoglund for this nice piece of code!
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WordPress hack: Get popular posts by comments count