Menuless Node Type | drupal.org

This module makes the Menu section in the node creation/edit form configurable per node type. This can be very useful since typically only the "page" node type is used in the menu tree on your average Drupal site.

This is a proof of concept related to this D7 usability improvement suggestion: #436836: Make visibility of Menu section in node form configurable per node type
If you're looking for a module that provides finely grained control of this, see http://drupal.org/project/ctm