Agaric Wants: to be able to add taxonomy terms en masse by checking off nodes in a list
Description
This would be huge. Huge I tell you. A major addition to the helpful administrative functionality Matthias Hutterer's Taxonomy Manager already gives us.
But it is tricky.
"Does anyone know of a module that lets one add taxonomy terms to nodes in bulk, e.g. from the content node admin page, search results, and/or a view?"
I had to ask that question on #drupal-support, but got no response.
So took this to #drupal:
ben-agaric: Feature request: to be able add taxonomy terms to nodes in bulk, e.g. from the content node admin page, search results, and/or a view.
[10:20am] munga joined the chat room.
[10:20am] ALZ left the chat room. (Read error: 110 (Connection timed out))
[10:20am] ben-agaric: Ideally, drupal's admin/content/node page, search results, and views would be able to have a common output standard
[10:21am] ben-agaric: to which you could choose to attach admin/content/node's mass edit ability.
[10:21am] ben-agaric: Which can already be extended I think.
[10:22am] Dralspire2 joined the chat room.
[10:22am] ben-agaric: That's fantasy for now, but is anyone thinking along those lines, or have any suggestions as to approach for my immediate use case: basic filtering of nodes, and the ability to check them off, and add a taxonomy term to all of them at once ?
The man himself answered:
merlinofchaos: ben-agaric: Yes, we're thinking along those lines for Drupal 7, but that's a year away.
And then I went back to talking to myself:
[10:24am] ben-agaric: Awesome.
[10:26am] ben-agaric: merlinofchaos: So you could add "Update options" to a view of nodes?
ben-agaric: If that case I'll look into extending update options to be able to add taxonomy terms through admin/content/node -- I think this might be difficult in itself, and it may need extending, so I will try to keep up on this integration-- help out on Drupal in head for the first time.

There is a module, [[http://drupal.org/project/taxonomy_node_operations|Taxonomy Node Operations]], which will perform batch term assignment the admin/content/node list using the "Update options" dropdown. It does a good job at this, but you can't really tell from the list which nodes really need this treatment. That's how I came across your post, as I was searching for ways to enhance the list with indicators for which nodes lack terms, and to sort the list by terms and vocabs.
The discussion below should have used the above as a starting place!
http://agaricdesign.com/note/irc-discussion-adding-taxonomy-term-all-nod...
Harry Slaughter of DevBee and Karim Ratib jump in and provide bulk operations on nodes from a view in Drupal 5.
http://drupal.org/project/taxonomy_node_operations is certainly the way to go for taxonomy issues, and can certainly integrate with views node operations for better searching ability.
But for simple little things that don't have an action yet, it becomes quite easy to make one's own:
Make a Drupal action that can be used with views node operations (disable comments on node exampe).