Taxonomy Multi Editor
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A mass category editor.
Allows any nodes shown on admin/content/node to have terms added or removed in bulk, using the normal 'node operations' selector.
Also provides a tab to view/edit all nodes terms individually.
With an image thumbnail, this can also be used for sorting uploaded images into galleries quickly.
Consider this module deprecated in favor of Views Bulk Operations - which offers a more cohesive interface to pretty much the same job
You may also experiment with editview or similar for mass updates.