I have enabled Gravatars on this site. Automattic has bought them and I think that they can add some personality to the comment section.
What is a Gravatar? A gravatar, or globally recognized avatar, is quite simply an 80Ãƒâ€”80 pixel avatar image that follows you from weblog to weblog appearing beside your name when you comment on gravatar enabled sites.
If you do not have one they are free. Get one here.