Allows you to paste code into comments or posts by surrounding it in `backticks`, just like in the Wordpress.org support forums.
This plugin will allow you to remove an unwanted author-URI entered by a commenter with one single click of your mouse.
Unique Comment Notify appends the author’s name to subject of notification e-mails.
INAP uses AJAX to replace excerpts with the full posts, paginate posts, load comments and submit comments. Comes with a extremely powerful Admin Panel
The plugin will show the top first commentors (the numner is number is set by user) of your blog.
Allows readers to choose the comment sort order and allows for filtering of Trackbacks/Pingbacks.
Ajaxify commenting with the MooTools JS Framework- mootools.net
Easily separate comments from trackbacks and pingbacks