Recent Comments with Gravatar is a WordPress widget that does the same thing with the standard Recent Comments widget in WordPress >2.8 with addit
Collect and display visitor reviews and ratings!
Collect and display visitor comments in a custom feed!
This WordPress plugin/widget will display top commenters of your blog in the form of gravatar images. The images can be stacked up or listed in a side
Highlight (or bury) extraordinary comments, and display them in a widget, archive, or both. (Extends "Featured Comments.")