wesg

Most Popular Posts is a basic widget for your sidebar that creates a list of links to the top posts on your blog according to the number of comments on the post. You can customize many aspects of the plugin to fit in your blog.
Updates include including and excluding categories, reverse the order of comments and incorporation of WordPress widget standards.
For a complete list of the changes from each version, please visit <a href="http://www.wesg.ca/2008/08/wordpress-widget-most-popular/#changelog" rel="nofollow ugc">the plugin homepage</a>.
For examples and tips on using the plugin, please check <a href="http://www.wesg.ca/2008/08/wordpress-widget-most-popular/#examples" rel="nofollow ugc">the examples</a> on the plugin homepage.
<h4>Usage</h4>
Used exclusively as a widget at the current time.

Most Popular Posts

This is a very simple widget that displays a link to the top commented posts on your blog.

Ron Zvagelsky

Integrates with the Disqus API to show your most popular threads (most commented posts). Can be added via sidebar widget, template tag, or shortcode.
<a href="http://presshive.com/plugins/disqus-popular-threads-widget-for-wordpress/" rel="nofollow ugc">For more information or to request additional features, please visit the plugin page</a>

Disqus Popular Threads Widget

Shows your most commented posts from Disqus via widget, shortcode, or template tag.

Most Popular Posts vs Disqus Popular Threads Widget