I saw these on Chris Davis’s site (see example in the comments: New Plugin) and they look pretty cool.

Gravatar – Globally Recognized Avatar

What is a gravatar?

A gravatar, or globally recognized avatar, is quite simply an 80×80 pixel avatar image that follows you from weblog to weblog appearing beside your name when you comment on gravatar enabled sites. Avatars help identify your posts on web forums, so why not on weblogs?

I might just have to get me one of them GRAVATARS!