As you run your blog you may find yourself building relationships with some of your visitors. I know that when someone puts in the time to be a repeat commentator to my blog I often find myself wanting to investigate that person a little. I may visit their blog and read a handful of their posts.
One of the problems I had was that I could never easily tell how many comments a given person contributed. It would be nice to know who our top commentators are.
In addition to satisfying my own curiosity, your users might also like to know how many comments total they have logged.
Now we both can tell! And much more...
You can learn more here: http://www.search-this.com/2008/05/05/wordpress-plugin-comment-info-tip/
To see it in action just mouse over a commentator's name - you should then see the tip pop up.