Nader

The “Most Comments” plugin displays as the name says posts with the most comments. You can either use the widget in the sidebar or integrate the plugin as template tag in your theme files.
Features:
<ul>
<li>Limit the amount of posts to be shown</li>
<li>Show comments from a specific post category</li>
<li>Exlude posts without comments</li>
<li>Select a time range (last XX days) of posts to be taken into account</li>
<li>Customize the design template via the settings page</li>
<li>Place a widget in your sidebar</li>
</ul>
More Information & Feature Description: 
http://www.brandinfection.com/wordpress-plugins/most-comments/
<h3>Configuration</h3>
You can configure the most comments plugin to your needs. Options can be found under the menu <code>Settings > Most Comments</code>

Most Comments

Display posts with the most comments, as a widget or on a page using the template tag. Customize the look with specific settings.

byybora

Google PageRank Display shows your site pagerank instantly and you can change style from General Options. 
more than 130+ pagerank buttons & badges. 
 * Install files 
 * Activate the plugin 
 * Go General Options [<code>options-general.php?page=gpdisplay</code>] 
 * Choose style you like 
 * Update option
<ul>
<li>And add this code your theme // <code><?php show_gpdisplay() ?></code></li>
</ul>
Features:
<ul>
<li>Real Google Pagerank : Shows real google pagerank, not fake</li>
<li>Many Style : There are 134 different pagerank button and badges</li>
<li>Automatic : just you change style from option</li>
<li>Fast : Loading pagerank fast, get image remotely.</li>
<li>Get your site page rank instantly</li>
</ul>
Details: <code>http://www.getrank.org</code>
<h3>Arbitrary section</h3>
See homepage for updates <a href="http://www.getrank.org/" title="GetRank" rel="nofollow ugc">http://www.getrank.org</a> .
<blockquote>
Instantly Check Free Your Site Google PageRank **
</blockquote>

Google PageRank Display

Check your site free google pagerank value with more than 130 pagerank buttons and badges

Most Comments vs Google PageRank Display