function clearDuplicatePosts(){
	global $wpdb;
	$prefix = $wpdb->prefix;
	
	$wpdb->query("DELETE bad_rows . * FROM ".$prefix."posts AS bad_rows INNER JOIN (
		SELECT ".$prefix."posts.post_title, MIN( ".$prefix."posts.ID ) AS min_id
		FROM ".$prefix."posts
		GROUP BY post_title
		HAVING COUNT( * ) >1
		) AS good_rows ON ( good_rows.post_title = bad_rows.post_title
		AND good_rows.min_id <> bad_rows.ID )");
}
add_action('publish_post', 'clearDuplicatePosts');