Wall of Fame is a plugin that displays most active commentators in a grid. All you need is insert [walloffame] shortcode into your content. As an administrator you can set avatar size, colors and how many honored commentators to show. Plugin also has Wall of Fame widget, so you can easily insert it into widgetized areas. Add spectacular feature to your website and motivate visitors!
Demo: http://codecanyon.net/item/wall-of-fame/2343578
