jimmysun

Simple Popular Posts is a plugin that creates a widget for you to put on your sidebar. The widget shows the most popular posts on your blog, based on the number of comments.
It is a very simple and basic plugin. It only has 3 options: 
– the widget title 
– the number of posts you want to show 
– whether you want to show the number of comments or not
Based on the Most Popular Posts plugin by Wes Goodhoofd (http://www.wesg.ca/2008/08/wordpress-widget-most-popular/)

Simple Popular Posts

Creates a very simple and basic widget for your sidebar to display most popular posts on your blog based on the number of comments only.

Kamal Hosen

This is a simple widget like others to show your most popular posts based on views of your post. Put it in any of your widget area from your WordPress dashboard and the it will automatically show 5 most popular posts which will be visited most after the activation of the widget.So, after activation of the widget, visit a post of your website and see, it will show below the popular post title.

Simple Popular Posts vs Popular Post Widget with Thumbnail