Wordpress: Seeking for multiple post types in the loop

gistfile1.php

<?php
add_filter('request', 'myCustomRequest', 0);

function myCustomRequest($req){
    if(!is_admin()){
        /*
         * In admin context we will ignore it
         */
        if(!isset($req['page'])){
            /*
             * is it a page or post? 
             */

            /* If the post_type is not set I will assume it's default "post" */
            if(!isset($req['post_type'])) $req['post_type'] = array('post');  


            /* 
             * Then finally I will add the custom type to the selection
             */
            $req['post_type'][] = 'my-custom-post';
        }
    }
    return $req;
}
?>