Top Commentators Widget
Just like it says, the Top Commentators Widget displays the top commentators on your site. This widget can be easily added to your sidebar.
To install it, please go to:
http://wordpress.org/extend/plugins/top-commentators-widget/installation/
IMPORTANT: I’m a newbie, installation went hassle free. But, in the last set of steps, they ask you to drag the Top Commentators Widget onto the sidebar. Be VERY careful. I apparently dragged my widget on top of what was already there. So, this deleted everything I had in the side bar except the new widget. Don’t fear though, it was easy to add back everything I had. Not knowing what everything was, I ended up adding all of the widgets. This turned out to be a great learning experience, now I know what they do and how to edit the sidebar.