Taxonomy Manager

This module provides a powerful interface for managing taxonomies. A vocabulary gets displayed in a dynamic tree view, where parent terms can be expanded to list their nested child terms or can be collapsed.

The Taxonomy Manager has following operations and key features:

* dynamic treeview
* mass deleting
* mass adding of new terms
* moving of terms in hierarchies
* merging of terms
* fast weight changing with up and down arrows (and AJAX saving)
* AJAX powered term editing form
* simple search interface
* CSV Export of terms
* i18n support for multilingual vocabularies (per language terms)
* Double Tree interface for moving terms in hierarchies, adding new translations and switching terms between different vocabularies

For using the Taxonomy Manager you should have JavaScript and automatically load of images enabled in your browser.

This is a Google Summer of Code 2007 project. Read my proposal and my status reports for more information.

Taxonomy Manager Drupal 5 and JQuery Upadate module:
In case you are using the JQuery Update module v2.x on your D5 installation, the Taxonomy Manager won't work. See this issue for more information.
To fix the problem download the tree.js file and replace it with the one included in the taxonomy manager folder under /js.

Taxonomy Manager Drupal 6 and Panels 3 / Taxonomy Breadcrumb:
Taxonomy Manager and other taxonomy modules might conflict, if both try to override the taxonomy/term/% path. Taxonomy Manager uses this to redirect previously merged terms to their new term. If you do not need this feature or if you want to used Panels 3 / Taxonomy Breadcrumb, you can disable it under Administer > Site Configuration > Taxonomy Manager. See this issue for more information.

source: http://drupal.org/project/taxonomy_manager