denishua

When a reply is made to a comment the user has left on the blog, an e-mail shall be sent to the user to notify him of the reply. This will allow the users to follow up the comment and expand the conversation if desired. 
Detail information: http://theme10.com/comment-reply-notification/
中文介绍： http://fairyfish.net/2008/11/03/comment-reply-notification/

Comment Reply Notification

When a reply is made to a comment the user has left on the blog, an e-mail shall be sent to the user to notify him of the reply.

leo108

When someone reply a comment, the person who receive this reply will receive a mail. 
当有人回复评论时，被回复的人会收到一封提醒邮件。

Comment Reply Notifier

When someone reply a comment,the person who receive the reply will receive a mail 有人回复评论时，被回复的人会收到一封提醒邮件

Comment Reply Notification vs Comment Reply Notifier