1-2-3 Categorizer

1-2-3 Categorizer is a WordPress plugin for the easiest massive category assignment. Extremely handy and simple in use, it saves your time and makes categorization as easy as 1-2-3. If you need to make reorganization of posts (change categories structure) or introduce a new category and assign it to many posts – 1-2-3 Categorizer is a great way to accomplish it all within a couple of clicks. Custom taxonomies and custom posts are supported now!