Highlight Scheduled Posts (WordPress)

<?php
/*
Plugin Name: Highlight Scheduled Posts
Plugin URI: http://www.inerciacreativa.com/
Description: Highlights scheduled posts in the admin post listing
Author: Jose Cuesta
Version: 1.1
Author URI: http://www.inerciacreativa.com/
*/

if (is_admin()) {
    wp_register_style('hsp', plugin_dir_url(__FILE__) . 'hsp.css');
    wp_enqueue_style('hsp');
}

?>