qakcn

This plugin replaces build-in Gravatar with Tietuku Avatar Service. And replace Google fonts and scripts with USTC mirror. All for Chinese users.
这个插件用贴图库头像服务替代了WordPress内置的Gravatar，并且用中国电子科技大学的镜像替代Google字体和脚本。中国用户都懂的。

Tietuku Avatar for WordPress

Use Tietuku Avatar service to replace Gravatar. And replace Google fonts and scripts. 用贴图库头像服务替代Gravatar。并且替换Google字体和脚本。

blueinstyle

Display your top commenters or authors in a widget, or you can display anywhere on your blog by pasting this code into your theme: <code><?php if(function_exists('jme_top_contributors')) { jme_top_contributors(); } ?></code>
Version 1.4 includes many user requested features. Check <a href="http://justmyecho.com/2010/07/top-contributors-plugin-wordpress/" rel="nofollow ugc">plugin webpage</a> for details on the update.
<ul>
<li>List your top commenters or authors with the option to display their Gravatar, and several other options.</li>
<li>Choose from 2 formats of the widget, with complete control of styles via css.</li>
<li>Exclude users from the list by email address.</li>
<li>The list uses a cache system for improved performance. List updates only when a post or comment is added, or options updated.</li>
</ul>
<h4>Extra Feature</h4>
<ul>
<li>Add a special Icon next to each of your Top Commenter’s name in their comments to give them a little special recognition for being a regular contributor.</li>
</ul>
Support and Feature request forum at http://justmyecho.com/forums/

Top Contributors

Display your top commenters or authors in a widget.

Tietuku Avatar for WordPress vs Top Contributors