The NAVT WordPress Navigation List Plugin has been around for a while now. It allows for full customization of all aspects of the navigation to your site. Create multiple navigation menus and simply drop them in as widgets into your theme. Although it’s a very flexible plugin, it is fully reliant on AJAX on the backend. To a lot of developers that might sound like an attractive feature, but if you ever have a JavaScript error on the back end of WordPress from any other plugin, it will keep you from updating NAVT. Other than that annoyance NAVT seems to be the leader in replacing the wp_list_pages function of WordPress.

Plugin Homepage
http://atalayastudio.com/