In previous versions of WordPress if I wanted to display a list of child pages I'd just use something like:
<ul><?php wp_list_pages('title_li=&child_of='.$post->ID); ?> </ul>
as described at http://codex.wordpress.org/Template_Tags/wp_list_pages
I have been trying to work out how to do this with the new menu system in 3.0 and so far have found nothing. Can anyone help?