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..

jaric

Basing on WordPress Plugin “tagthepress” .It using for tag suggestions by Yahoo cas API 
http://tw.developer.yahoo.com/cas/
With this plugin, you will be able to use the the Web service for your posts. Just click on <code>Fetch tags</code> and the title, content and optional excerpt of your post will be analyzed by Yahoo cas API in order to find words that could be useful as tags.
It currently works with English, Chinese

AutoTags

Basing on Wordpress Plugin "tagthepress" .It using for tag suggestions by Yahoo cas API

IWG Faster Tagging vs AutoTags