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Highlight comments with a background color in the WordPress Comments Admin pages. Choose the criteria for highlighting a comment, add a note to show it with, and pick the highlight color.
This plugin is “for internal use” and only highlights comments within the WordPress Comments admin. The typical use case for this plugin is to inform/remind users about what to do for a particular type of comment. Examples:
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<li>
Comments from John Doe – Always approve unless it’s about topic XYZ
</li>
<li>
Comments from IP 12.34.56.78 – Give a personal, non-standard response to these comments
</li>
</ul>
You can highlight a comment based on the contents of the commentor’s name, email, or IP address.

Comment Moderation Highlights

Highlight comments in the Comments Admin. Pick a color, add a note.

When a post gets old, instead of simply closing the discussion, send comments and trackbacks to the moderation queue. This will greatly reduce spam.
For documentation and tips, please refer to the official plugin page for <a href="http://planetozh.com/blog/archives/2005/02/02/wordpress-plugin-auto-moderate-comments/" title="Auto Moderate Comments" rel="nofollow ugc">Auto Moderate Comments</a>

Ozh' Auto Moderate Comments

When a post gets old, instead of simply closing the discussion, send comments and trackbacks to the moderation queue.

Comment Moderation Highlights vs Ozh' Auto Moderate Comments