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.

Ben Huson

<blockquote>
This plugin in only required for versions prior to WordPress 3.5 
 I am no longer continuing to provide support for this plugin. If anyone would like to take over commit access please contact me via the details in my profile.
</blockquote>
This plugin collapses and reduces the height of hierarchical category and taxonomy panels in the WordPress admin.
It always bugged me that when editing a post the categories panel took up so much height if you only had a few categories. This was also the same for custom hierarchical taxonomies.
This plugin just adds a couple of styles to your admin to override this and collapse that space.
I created an initial patch for this which, with contributions from other WordPress developers, was included in WordPress 3.5. You can <a href="https://core.trac.wordpress.org/ticket/15925" rel="nofollow ugc">see the patch here…</a>

Compact Taxonomy Checkboxes

Collapse and reduce the height of hierarchical category and taxonomy panels in the WordPress admin (not needed for WordPress 3.5+).

Post Taxonomy Column vs Compact Taxonomy Checkboxes