Will Brubaker

You’ve poured your heart and soul in to writing fascinating blog posts.  You know you have a lot of readership, but nobody except your mom is leaving comments.  That’s a bit discouraging right?  Entice your readers to leave comments by giving them a picture of a cute kitten in return.
Just prior to the comment form coming in to view, an unobtrusive panel will be displayed with a short message that says: “Your comments make us happy.  Leave a comment, get a kitten!”
 
When a comment is submitted, a picture of an adorable kitten is displayed in a modal window.
Caveats:
This plugin assumes that your comment form is A) built with the ‘comment_form’ WordPress function and B) that your comment form has an id of “commentform” (This is the WordPress default, but your theme developer may have changed the behavior for whatever reason. 
This plugin assumes that comment forms only appear on single posts and only loads the code when a single post (or page) is loaded. 
 
<h3>Other Information</h3>
I created this plugin for my own amusement and am offering it for you to use as you wish.  If you find it useful but would like more features, please do ask.

Kittens for Comments

Works well, customizable and just damn cute! Love it. =D



Awesome

Encourages your readers to leave comments with the promise of a kitten picture.  Who doesn't love kittens?

ctltwp

The plugin gives users the oportunity to embed a summary of commented 
posts within any page. When using the shortcode [blog_activity] when 
writing in the content of any page, the user includes in the page, a 
table that displays on each row information about a certain post 
that received any comments.
The columns on which the information is distributed are “post” (the 
title of the post), “By” (who created the post), “Published” (how long 
ago it was published), “Comments” (how many comments have been posted) 
and “Last Comment” (when was the last comment posted). Also, whenever 
someone clicks on the plus sign adjacent to any post, the content of the 
post is displayed, along with all the comments it received. This content 
can be immediately contracted, by clicking the plus sign again.
The table can be adjusted to be expandable or non-expandable by using 
the management options for the BlogActivityShortcode plugin.

Blog activity shortcode

wordpress mu Requires at least: 2.6 Tested up to: 2.7 Stable tag: trunk The plugin enables any user to display summarized information on any of the  …

Kittens for Comments vs Blog activity shortcode