cool thanks - will have to find someone to install it I guess

The page "/taxonomy/term/4" displays only nodes of category 4 (DRUPAL) The page "/taxonomy/term/1/all" displays all nodes of category 1 and all its children.

If you want all your category listings to include the children and you don't want to add "/all" every time, there is a module for that: http://drupal.org/project/taxonomy_forceall