Amaury Balmer

For WordPress 2.3 and upper : Please try and use <a href="https://wordpress.org/extend/plugins/simple-tags/" title="The best tagging plugin for WordPress 2.3 !">Simple Tags Plugins</a>
The two mostly used tagging plugins are the Ultimate Tag Worrior (UTW) and Jerome’s Keywords.
I think most people use UTW, however especially its performance has been criticized in the past. Also, it does not provide a auto-complete type-ahead dropdown menu when tagging posts but it always displays all tags of the entire WordPress installation which can be quite annoying if you have really many tags.
Jerome’s Keywords is unfortunately still in beta and it seems that the project will not be continued.
With Simple Tagging Plugin, I’ve coded another tagging plugin for WordPress which is based on Jerome’s Keywords plugin and can ”’import”’ all your tags from UTW or Jerome.
It provides you with everything you need for tagging, in the following a list of the features:
<ol>
<li>Import your tags from UTW or Jerome’s Keywords</li>
<li>A field for tagging your posts easily incl. type-ahead feature</li>
<li>Display Tags of the current posts</li>
<li>A tag cloud with various options</li>
<li>Displaying a list of related posts</li>
<li>Related Tags feature when browsing your tags (idea stolen from del.icio.us)</li>
<li>Adding tags (& categories if enabled in the options) as meta keywords in the header</li>
<li>Adding tags as categories in the feed (this will index your tags with Technorati)</li>
<li>Tag management: rename tags, delete tags, replace tags, convert categories to tags, etc.</li>
<li>Support of embedded tags ([tags]tag1, tag2, tag3[/tags]): You can tag posts directly by entering the tags in the post using [tags]tag1, tag2, tag3[/tags]. This makes it possible to tag posts when you use an external blogging application like BlogDesk or Windows Live Writer.</li>
<li>A feed (RSS, RSS2, Atom) for any tag</li>
<li>Tag cloud for specific category</li>
<li>Automatically display the tags of a post after the post content</li>
<li>Generate Tag Tabs with jQuery !</li>
<li>Manage Tags Cloud in FULL WordPress Mu Site !</li>
<li>List posts from all blogs for a specific tags in WordPress Mu !</li>
<li>Edit mass tags ! 20 posts at the same time !</li>
</ol>
And more…
<h3>Arbitrary section</h3>
New in version 1.7: 
 * Reorganise Admin Options 
 * Add Tag Tabs 
 * Fix lots of bugs. 
 * Fix test $wp_version 
 * Atom Feed fix 
 * Add mass edit tags ! 
 * Fix a security problem
New in version 1.6.8.1: 
 * Fix a important bug with related posts
New in version 1.6.8: 
 * Fix bugs version 1.6.7 
 * Fix wrong counter tags 
 * Admin bugs. (checked) 
 * Minor optimisation 
 * Site wide tag cloud for WordPress Mu + List of posts. 
 * Add translation: Russian & Czech
New in version 1.6.7: 
 * Fix bugs version 1.6.6 
 * Compatibility with MySQL 4.0 
 * Optimisation
New in version 1.6.6: 
 * Add auto color tags cloud (no CSS, Colorpicker in admin) 
 * Add Turkish translation 
 * An option to limit the number of related tags 
 * A possibility to call/display the related posts outside a loop 
 * Tags Feed 
 * limit the age of what posts show up in the tag cloud 
 * An option to automatically display the tags of a post after the post content 
 * Limit or exclude category or categories in Tag Cloud 
 * Ability to exclude specific categories from the related posts 
 * Tag Cloud for one category
New in version 1.6.2: 
 * Related Posts now work…
New in version 1.6.1: 
 * Internationalisation (french, english, german) 
 * Compatibility with WPmu

Simple Tagging

For WordPress 2.3 and upper : Please try and use [Simple Tags Plugins](http://wordpress.org/extend/plugins/simple-tags/ "The best tagging plugin  …

Matthew Muro

Multi-Column Taxonomy List is a plugin that allows you to list your categories, tags, or custom taxonomies into multiple columns.
This plugin is great to use on custom archives index pages to display all categories, tags, and custom taxonomies on a single page. You can also turn the list into links to the RSS feeds for your taxonomies.
<h3>Usage</h3>
<h4>Shortcode attributes</h4>
You can implement a new list by adding the shortcode <code>[mctl]</code> to the content of a page. By default, it will output the categories into three columns with a heading of Categories. You can customize the output using attributes in the following format: <code>[mctl taxonomy='post_tag' title='Tags']</code>
<ul>
<li>taxonomy: The taxonomy to retrieve terms from
<ul>
<li>Valid values: <code>category</code>, <code>post_tag</code>, <code>custom_taxonomy_name</code></li>
<li>Multiple values not allowed</li>
<li>Default: <code>category</code></li>
</ul>
</li>
<li>title: Sets the title of the list
<ul>
<li>Valid values: any string</li>
<li>Default: <code>Categories</code></li>
</ul>
</li>
<li>title_container: HTML element to wrap the title in
<ul>
<li>Valid values: any HTML element</li>
<li>Recommended values: <code>h1</code>, <code>h2</code>, <code>h3</code>, <code>h4</code>, <code>h5</code>, <code>h6</code>, <code>p</code></li>
<li>Default: <code>h3</code></li>
</ul>
</li>
<li>columns: Sets the number of columns to use
<ul>
<li>Valid values: any integer</li>
<li>Default: <code>3</code></li>
</ul>
</li>
<li>orderby: Sort terms by name, unique ID, slug, or the count of posts in that term
<ul>
<li>Valid values: <code>name</code>, <code>id</code>, <code>slug</code>, <code>count</code></li>
<li>Default: <code>name</code></li>
</ul>
</li>
<li>order: Sort order for the terms (either ascending or descending)
<ul>
<li>Valid values: <code>ASC</code>, <code>DESC</code></li>
<li>Default: <code>ASC</code></li>
</ul>
</li>
<li>alpha_grouping: Output the first letter of each alphabetical grouping
<ul>
<li>Valid values: <code>0</code>, <code>1</code></li>
<li>Default: <code>0</code></li>
</ul>
</li>
<li>show_count: Toggles the display of the current count of posts in each term. <code>0</code> is false/off and <code>1</code> is true/on
<ul>
<li>Valid values: <code>0</code>, <code>1</code></li>
<li>Default: <code>0</code></li>
</ul>
</li>
<li>exclude: Exclude one or more terms from the results.
<ul>
<li>Valid values: unique IDs, separated by commas. (ex: <code>exclude='12,13,22'</code>)</li>
<li>Default: no default</li>
</ul>
</li>
<li>parent: Get direct children of this term
<ul>
<li>Valid values: any integer</li>
<li>Multiple values not allowed</li>
<li>Default: no default</li>
</ul>
</li>
<li>child_of: Get all descendents of this term
<ul>
<li>Valid values: any integer</li>
<li>Multiple values not allowed</li>
<li>Default: <code>0</code></li>
</ul>
</li>
<li>rss: Turns the list into links to RSS feed of term. <code>0</code> is false/off and <code>1</code> is true/on
<ul>
<li>Valid values: <code>0</code>, <code>1</code></li>
<li>Default: <code>0</code></li>
</ul>
</li>
<li>rss_image: Use a custom image RSS image icon when <code>rss</code> is on.
<ul>
<li>Valid values: full URL to image</li>
<li>Default: <code>/wp-includes/images/rss.png</code></li>
</ul>
</li>
<li>number: Max number of terms to display
<ul>
<li>Valid values: any integer</li>
<li>Default: display all terms</li>
</ul>
</li>
<li>like: Return terms that begin with this value
<ul>
<li>Valid values: any string</li>
<li>Default: no default</li>
</ul>
</li>
<li>search: Return terms that contain the ‘search’ string
<ul>
<li>Valid values: any string</li>
<li>Default: no default</li>
</ul>
</li>
</ul>
<h4>Template tag</h4>
Alternatively, you can implement a new list by adding the the template tag <code><?php multi_column_tax_list(); ?></code> anywhere in the code of your theme. Just like the shortcode, by default it will output the categories into three columns with a heading of Categories. You can customize the output using a string of parameters in the following format: <code><?php multi_column_tax_list( 'taxonomy=post_tag&title=Tags' ); ?></code>
Refer to the above attributes for customizations.

Multi-Column Taxonomy List

List your categories, tags, or custom taxonomies into multiple, customizable, columns.

Simple Tagging vs Multi-Column Taxonomy List