For mass categorization or labeling of Drupal content, use the "taxonomy node operations" module:
http://drupal.org/project/taxonomy_node_operations
"Adds the ability to assign terms to nodes in the node operations dropdown in admin/content/node."
"It takes advantage of hook_node_operations to facilitate batch taxonomy assignments."
We'd missed this very helpful module until a search for something else found Shai's helpful post on the drupal-support list archives:
Beware, it doesn't even come with a readme file nor does it even show up on /admin/by-module. But it is simple, just enable it as normal at /admin/build/modules and then go to:
admin/content/node
It adds so much power to administering nodes.
benjamin, Agaric Design Collective
