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  …

Marzio Carro

Adds categories and tags functionality for your pages.
This plugin addsthe ‘post_tag’ and the ‘category’ taxonomies, which are the names of the existing taxonomies used for tags and categories the Post type ‘page’.
This enables the categories metabox and the tags metabox in the New or Edit Page interface.
The plugin has no settings, does not alter the database and only uses hooks to 
achieve it’s goal. It works perfectly fine with Multisite installations.
This plugin WILL NOT add any display of categories or tags to your template files.
Plugin’s website: <a href="http://technotes.marziocarro.com/category/wordpress-plugins/" rel="nofollow ugc">http://technotes.marziocarro.com/category/wordpress-plugins/</a>
Author’s website: <a href="http://technotes.marziocarro.com/" rel="nofollow ugc">http://technotes.marziocarro.com/</a>

Category Tag Pages

Wonderful functionality

Yes, it works. Uses very few lines of code and it's a simple and safe solution to have categories and tags in pages.

It works

Adds categories and tags functionality for your pages.

Simple Tagging vs Category Tag Pages