Lorna Timbah

This plugin creates a widget to show the top commentators in your WP site. Always go back to the Widget settings after each version update to Save your settings. Demo can be found at http://demo.webgrrrl.net
The Top Commentators Widget plugin is adapted from Show Top Commentators plugin at Personal Financial Advice, this widget is easier to manage via the control form (no need to edit the PHP file); additional options are also available to make it more flexible. Read the FAQ section on how to customize the widget. Read the Changelog as well as http://webgrrrl.net/tags/tcw for the latest news on this widget.
This widget is extensively tested with the following settings: Google Chrome 13.0.782.215 m, PHP 5.2.13, Apache 2.2.15 (Win32), MySQL 5.0.51a, WordPress 3.2.1. Further testing and bug report on this widget is greatly welcomed and appreciated.

Top Commentators Widget

Adds a sidebar widget to show the top commentators in your WP site. Demo: http://demo.webgrrrl.net

Hareesh S

WP Custom Avatar – This light plugin adds the capability to change the default Avatar in your website. This is usually displayed when a person without a gravatar comments on your blog. 
1. Configure the plugin by going to <code>Appearance</code> > <code>Customize</code> menu that appears in your admin menu. 
2. Upload the Custom Avatar image in the WP Custom Avatar section. 
3. Navigate to <code>Settings</code> > <code>Discussion</code> menu. Scroll down to the Avatars section and choose the image that you uploaded as the Default Avatar.
<h3>Licence</h3>
This plugin is released under the GPL, you can use it free of charge on your personal or commercial blog.

WP Custom Avatar

Head to the support tab for any queries. You can also contact the plugin author via Email.

Feature requests are welcome!

Information regarding Support

WP Custom Avatar adds the capability to change the default Avatar in your website.

Top Commentators Widget vs WP Custom Avatar