The current documentation on the menu system is found in the incoming folder.
http://ez.no/ez_publish/documentation/incoming/how_does_the_new_menu_system_work
http://ez.no/index.php/ez_publish/documentation/incoming/how_to_customise_menu http://ez.no/index.php/ez_publish/documentation/incoming/how_to_use_menu_system_in_the_template
The doc for the template function will be added sometime today.
