Marcus Downing

This plugin improves the All Posts or All Pages view in the admin section by adding columns for 
any taxonomy you wish. There are two ways to use it:
<ol>
<li>Use the setting page to select the taxonomies.</li>
<li>Write code to add a column in exactly the right place.</li>
</ol>

Post Taxonomy Column

Tested up to 3.2.1 Stable tag: trunk Add columns to the All Posts, All Pages and custom post types for any taxonomies.

Edward Ruchevits

Adds autocomplete functionality to all taxonomy input fields in admin panel.

Admin Taxonomy Autocomplete

Adds autocomplete functionality to all taxonomy input fields in admin panel.

Post Taxonomy Column vs Admin Taxonomy Autocomplete