Skyy

This plugin allows you to banned certain username from making comment, particularly when you don’t want to ban 
ip addresses, but want to stop certain “notorious” misbehaving users.
If your blog requires user registration, you should really try the “members.0.1.1” wordpress plugin.

WP-Ban-User

mitcho (Michael Yoshitaka Erlewine)

If you need to implement a custom post type for human beings, where in lieu of a title you need a name, this plugin will add the proper UI. See screenshots for an example.
<h4>Usage</h4>
When creating your custom post type, just make sure you specify <code>name</code> as one of the post type’s features. (As of version 0.1, the <code>title</code> feature, quite counterintuitively, is also required as in the example below.)
<pre><code>register_post_type( 'people', array( 'label' => 'People', 'supports' => array( 'title', 'name', ... ) ... ) ); </code></pre>
Name Support also gives you the template tags <code>the_name()</code> and <code>get_the_name()</code> which prints or returns the name in “[First Name] [Last Name]” format.
Development of this plugin was supported by the <a href="http://arts.mit.edu/" rel="nofollow ugc">Arts at MIT</a>.

Name Support

Infrastructure plugin which adds UI support for custom post types with names instead of titles, e.g. "person" custom post types.

WP-Ban-User vs Name Support