artesea

Whereas the built in moderation just looks for keywords wherever they appear in the comments, Better Moderation allows you to define if it should just be the username, url, email, comment, ip, useragent or all of them. 
It also allows you to define if when looking for “word” whether you should match “WordPress”. 
Finally it lets you set reasons why words have been added to the list, allowing you to quickly realise why a comment has been added to the moderation queue.

Better Moderation

Provides more control over comment moderation

Erunafailaro

This plugin is intended to make the comment-moderation for the blog-owner a little bit easier. It does not detect comment-spam on its own. To successfully prevent spam, it should be used as an addition to the spam-protection provided by Akismet and Spam Karma.
This plugin adds a small button to every comment. This button will only be visibly to a logged-in blog-admin (that is a registered user with a user-level of 10).
When you press this button, the URI of the commenter will be replaced by the URI you can specify at the plugin?s option-page.
<h3>Plugin Homepage</h3>
The complete documentation is located at my website: http://www.weinschenker.name/comment-url-control/

Comment URL Control

This plugin will allow you to remove an unwanted author-URI entered by a commenter with one single click of your mouse.

Better Moderation vs Comment URL Control