New in version 1.2:
<ul>
<li>all changes only for WordPress MU (WPMU)</li>
<li>no changes for normal (single) WordPress</li>
<li>full WordPress MU (WPMU) support</li>
<li>runs on WPMU as an autoactivated plugin</li>
<li>the right place for installation is in wp-content/mu-plugins</li>
<li>activate/deactivate auto tag suggestion is only a site wide option</li>
<li>only site admin(s) can activate/deactivate auto tag suggestion</li>
</ul>
Features of version 1.1 are:
<ul>
<li>Show all your tags in alphabetically order as buttons on every post page</li>
<li>also tags with ‘ and ” in names are supported</li>
<li>To choose a tag, only a simple click on it is needed</li>
<li>All assigned tags are listed in alphabetically order. If you add or remove one or more tags, the tags will be automatically reordered for you</li>
<li>An administrator-option to switching off the auto-tag-complete (also called auto tag suggestion) on the whole WordPress-Blog</li>
<li>Full multi-language support. Translated languages are in the moment: English, German.</li>
</ul>
A complete description with some screenshots you can find on <a href="http://www.im-web-gefunden.de/wordpress-plugins/iwg-faster-tagging/" title="IWG Faster Tagging's Home" rel="nofollow ugc">Plugin Homepage at “im web gefunden”</a>.

IWG Faster Tagging

"IWG Faster Tagging" fixes some disadvantages from the original tagging-system at your editing post page..

dangrossman

The Calais Archive Tagger plugin automatically goes through your archives and tags every post you’ve written. The plugin uses the Open Calais API to perform semantic analysis of your post text and suggest tags. If a post already contains a suggested tag, that tag isn’t added, but other new tags found are. It takes about 5 minutes to tag 200 posts.
This plugin requires PHP 5 and the cURL library (both of which are available on most web hosts).
Also see <a href="https://wordpress.org/extend/plugins/calais-auto-tagger/" rel="ugc">WP Calais Auto Tagger</a> for suggesting tags as you write new posts.

WP Calais Archive Tagger

Goes through your archives and adds tags to your posts based on semantic analysis.

IWG Faster Tagging vs WP Calais Archive Tagger