This WordPress plugin lets you batch edit your posts: assign multiple posts to a category or delete multiple posts from a category in one fell swoop. Version 1.2 and above also support WordPress 2.3’s in-built tagging system, allowing you to tag and un-tag multiple posts at once.
For example, in this screenshot, you search for books with the “52-in-52 2007″ tag, and you’re about to add the “Books” tag to some of them.
