Here you have nice plugin in WordPress called Thank Me Later. With this plugin you can automatically sends the mail to those who commented on your site. Thank Me Later plugin gives facility to send the multiple E-Mails at the time which you pre defined.

This plugin reminds the visitors about their comment a few days later and attracts them to take participate in further discussion. This will keep connection alive after they leave your site.

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This plugin is used to reverse the order in which the top level comments are shown in a wordpress blog without modifying the theme. But nested comments are displayed in non-reverse order.

Requires WordPress Version: 2.8.4 or higher

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Thanks,

Shane G.

This plugin is used to provide an option to choose from the avatars you upload to your website for each and every comment they make. It also offers various configuration options.

Requires WordPress Version: 2.9 or higher

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Thanks,

Shane G.

This plugin is for users who have their wordpress blog in Google Buzz connected sites list. In that case discussions about the Blogposts often split in two separate threads.

Some users reply on Buzz and some on the Blog. This plugin adds the comments posted on Buzz about posts to the comments on the blog. The Buzz responses just get inserted between the normal comments in the correct chronological order. So the blog users can see the normal comments and the Buzz comments.

The plugin is beta and under heavy development. Please check from time to time for an update.

Requires WordPress Version: 2.9.2 or higher

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Thanks,

Shane G.

This plugin is used to send email messages to individual or a group of commenters. It lets Administrator to see who has wrote more comments on his post and mail to commenters.

Requires WordPress Version: 2.8 or higher

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Thanks,

Shane G.

This plugin is used to add comment blocks mid post. WordPress is used to show clients creative documents, a single post is dedicated to a single project. Each revision is appended to the post. This plugin tag will allow clients to provide feedback for a specific revision.

Admin users can mark the feedback as completed and approved while adding sub-comments and close out feedback on a revision.

The plugin includes multiple customizable elements including look and feel, email notifications, and post-specific email notifications.

Requires WordPress Version: 2.9.0 or higher

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Thanks,

Shane G.

This plugin shows post/page/category/tag/comment IDs on admin’s edit post/page/category/tag/comment pages. You can see the ID when you visit an edit post/page/category/tag/comment page and put the mouse pointer on.

This plugin hooks on ‘edit’ link and privileged user can see IDs. For example, a user of author role can see post IDs, but a user of subscriber role can not.

Requires WordPress Version: 2.9 or higher

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Thanks,

Shane G.

This plugin uses Flickr API to import comments from Flickr photostream photos to a post of choice in WordPress Blog. It additionally imports the Flickr Avatar Icons and displays them as appropriate.

FEATURES:

* Uses the Flickr API via the excellent phpFlickr class
* Relies on a custom field in the post to import comments thus your
* photos and posts need not have the same title
* Also imports the flickr user icons / avatars
* The comments are imported whenever anyone sees a post where comments
* are to be imported
* Allows import of even the old comments
* Can cache the results of flickr API

Requires WordPress Version: 2.8 or higher

More Details And Download

Thanks,

Shane G.

This plugin is used to support for comments and trackbacks, image resizing and thumbnailing with Lightbox.

Twitter doesn’t yet come with its own inline image support, so we tend to be limited to using image hosting services, and linking to them with short URLs. So, services like Tweetpic host the image, and we direct traffic to them in return.

Uses Twitter’s authentication and a list of authorised accounts, so you can let others use your image host too. You can even post status updates to Twitter while submitting images.

Requires WordPress Version: 2.6 or higher

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Thanks,

Shane G.

This plugin is used to eliminates blog comment spam, including trackback and pingback spam.

Features:

* Now with Enhanced Comment Blacklist option! Instead of just sending comments to moderation as with WordPress’s default Comment Blacklist functionality, with this turned on, anything that matchs a string in the blacklist will be completely blocked. Also adds a link in the comment notification emails that will let you blacklist a commenter’s IP with one click.
* See what’s been blocked! Version 2.0 adds “Blocked Comment Logging Mode”, a temporary diagnostic mode that logs blocked comments and contact form submissions for 7 days, then turns off automatically. If you want to see what’s been blocked, or verify that everything is working, turn this on and see what WP-SpamFree is protecting your blog from.
* Added option for smaller graphic counters to display spam stats, in addition to the existing normal-sized ones.
* Added Widget for displaying spam counter. Shows small counter #1. Now you can show stats without knowing any code.

Requires WordPress Version: 2.1 or higher

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Thanks,

Shane G.

This plugin is allow the administrator to keep track of the number of published blog comments over time. It tracks the published comments and tallies them month by month.

Requires WordPress Version: 2.3.2 or higher

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Thanks,

Shane G.

This plugin is used to display links to your wordpress blog’s:

* rss2 post feed
* rss2 comments feed
* atom post feed
* atom comment feed

You can choose if the user should see a little help link to the wiki post “What are feeds and what the hell is rss”.

Requires WordPress Version: 2.8 or higher

More Details And Download

Thanks,

Shane G.

This plugin is used to remove “nofollow” attribute from your wordpress blog’s comments. It can insert an image band at the top of your pages with the phrase: “NOFOLLOW FRE” to encourage your users to submit comments. This is an optional so you can disable/enable it upon the requirement.

This is multilingual supported plugin. It comes with a nice sidebar Widget support to show the top ten charts for the top commenters.

Requires WordPress Version: 2.x or higher

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Thanks,

Shane G.

This is comment related plugin. This plugin allows users to edit their own comments on wordpress blog. This plugin provides a bit of code which needs to be edited in comments.php file of your theme.

More Details And Download

Thanks,

Shane G.

This plugin keeps track of comments on their posts by marking them as todo, replied, or ignored, in Comments Administration page in the admin dashboard. This plugin paints each comment block with a color that either indicates the status set by the blog author or provides a hint on what the status might be.

FEATURES:

* Adds options to the Comments Admin page actions, for each comment, to mark it as Todo, Replied, or Ignore.
* Comment blocks are given a background colour based on their actual or guessed state (default = todo).
* Comments with a response from the post author are background coloured to indicate that.
* Comments by post authors are automatically coloured ignored (though not marked so).
* When new comments are added their parent (if any) is marked as responded if the response is by the post author.
* A bulk mark option/link in the plugin admin page lets you automatically flag existing comments as responded to by author — this has to be used with care of course, in case your blog has thousands of comments. Mine has hundreds and that went through pretty quick.

Requires WordPress Version: 2.9 or higher

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Thanks,

Shane G.