chrisnorthwood

Popular This Week is a plugin similar to Popularity Contest, but only records hits that happened in the last week. It then shows the most popular posts or pages in the last week as widget you can use in your theme.
It’s useful for high volume, high traffic sites where posts age quite quickly, and you do not necessarily want to direct your users to old content, but what people are reading right now. An example of the widget being used is here: http://www.nouse.co.uk/

Popular This Week

Provides a widget that shows the most popular posts in the last week.

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.

Popular This Week vs Most Comments