found this ste while surfing, it's a really cool site for gravatrs.
What is a gravatar?
A gravatar, or globally recognized avatar, is quite simply an 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?
Cool huh ? give it a try I know alot of people might find it enormously useful ^__^
