Comment E-Mail Verification is a WordPress Plugin. It sends an e-mail message to the comment author when a comment is held for moderation. The e-mail message contains a link to verify the comment author’s e-mail address. When the comment author clicks on that link the comment gets approved immediately. This makes discussions more lively as users don’t have to wait for the blog admin to approve the comment.
This plugin is in still in early development. The current version number is 0.4.2
Please go to http://wordpress.org/extend/plugins/comment-email-verify/ to download and test it!