godthor

This will create a new widget which will display your most popular posts and pages based on comment count with Disqus. Alternatively, you can use a shortcode as well.
It’s very simple to use. Just drag the widget into a sidebar and configure it, or visit the settings under the WordPress Settings menu.
Just Some of the Options:
<ul>
<li>Show featured image.</li>
<li>Choose featured image size.</li>
<li>Choose featured image alignment.</li>
<li>Show the post date.</li>
<li>Select how many days to check, IE: past 90 days.</li>
<li>Set how many posts to show.</li>
<li>Save the results for faster loading.</li>
<li>Load results using Ajax. Perfect to avoid caching results.</li>
</ul>
Note: This plugin requires you have an application registered with Disqus: https://disqus.com/api/applications/ 
It’s free and simple to setup, just follow that link.

Disqus Popular Posts

Creates a widget to show the most popular posts and pages on your site based on Disqus comments. Can also be used with a shortcode.

Speeddymon

Shows Pingbacks and Trackbacks above Disqus comments.
All credit for the functionality of this plugin remains with the original creator, Marco Luthe of http://www.saphod.net 
Additional credit to Scottsdale Computing (http://theitbros.com) for some formatting changes they made when posting this on their site 
This was originally created as a theme modification. It has been turned into a plugin by myself, Thomas Spear.

Force Ping Display with Disqus

Shows Pingbacks and Trackbacks above Disqus comments.

Disqus Popular Posts vs Force Ping Display with Disqus