No more checkboxes, let's radio in.
Enhances the body_class template tag, adding some extra classes to the body (post/page slugs, post categories, and archive parent categories) useful i
Create independent query of posts and pages mixing taxonomies, standard categories, custom values, etc. with shortcode.
Automatically adds custom taxonomy columns to admin list tables.
Adds ability to create custom content types (post_types) and taxonomies to your WordPress installation.
A smart plugin that helps you to optimize the blog for SEO purposes.
The WP Category Manager plugin makes it easier to manage any taxonomy that is used to control the posts within widgets in the presentation layer
Add, Edit, Delete & Manage taxonomies for posts, pages, links and custom post types with a few clicks of mouse. Makes adding taxonomies a 100 time
Adds a "View" button to the top of an 'edit category'
Strips off the domain name and leaves the path and query string when you click on "Get Shortlink"
Add "Get Shortlinks" to the admin side for Pages, and Taxonomies (includes custom taxonomies, categeories, and post tags)
Adds a 'view' to the category row action, allowing you to quickly see all posts by that category
WordPress 2.8 and up allow for reasonably simple custom taxonomies, this plugin makes it even simpler, removing the need for you to write any code.
Friendz implements profiles, paginated and customizable user lists, and some characteristics of social networks, like friends and sets.
Custom Taxonomies provides a full administrative interface for creating and using taxonomies beyond the standard Tags and Categories.