Comment-Emailer allows you to customize the email wordpress automatically
sends when a new comment, pingback or trackback has been approved.
This plugin allows you to delete Posts, Pages and Comments without moving them to Trash first. Additionally it restores all Are you sure? questions.
AdCaptcher.com enables you to build custom captchas. You need an AdCaptcher account to administrate your custom captchas.
Enable oEmbed support for comments. Requires WP 2.9+.
This plugin allows you to easily move comments between posts and pages, and it allows you to change comment threading.
Hikari Titled Comments enables each comment to have a title, so that commentators can give a subject meaning to their comments.
Add a Subscribe to MadMimi Checkbox after the comment form
Stops a post from from immediately being published on feed.
WordPress Toolbar (supports WPMU since v 2.2) is a unique plugin which automatically enables a toolbar for all outgoing links from your blog post, sim
Adds additional technical information to comment notifications, including referrer, User-Agent, and a lot more.
Comment Counter - Count comments by a commentator.
Allows you to expand and preview short URL's in comments, useful to detect spam or links to malicious sites before comment approval.
Posts comments without refreshing the page and validates the comment form using Ajax.
This plugin enhance the current activity stream on a BuddyPress user profile
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