With complex and long taxonomies, assigning a node to a term can be very troublesome. The recent addition of of a field_selectdb to pull data from the database to populate a pulldown menu opens up the possibility of adding two dependent menu, so you would get e.g. countries first, and then a second box with cities. This would be a god send for those of us using Drupal with large taxonomies and expecting users to file their nodes in the correct category.