Speedboxer

The Comment Approval Notification plugin will send an email to the comment author when you approve their comment. The email sent is fully customizable, with shortcodes, through a settings page.
Please note that this plugin has only been tested with PHP 5.2.x.
A full list of available shortcodes is available <a href="http://mattsblog.ca/plugins/comment-approval-notification/#shortcodes" title="Available Shortcodes" rel="nofollow ugc">here</a>.

Comment Approval Notification

Sends an email to the comment author when their comment gets approved (only if it's held for moderation).

Ronald Huereca

Crowd Control gives your users the ability to report comments as inappropriate with a single click. If a comment gets flagged multiple times it’ll be removed from the post and marked as pending moderation. We’ll even send you an email to let you know. Now you can still go away on vacation and rest assured the trolls won’t overrun your site.

Crowd Control by Postmatic – Comment moderation decentralized

Comment moderation is a drag. Have your users lend a hand by flagging offensive comments and scrubbing your site clean.

Comment Approval Notification vs Crowd Control by Postmatic – Comment moderation decentralized