Gravatar

Gravatar, which stands for Globally Recognized Avatars, is an awesome free online service. Anyone can create an account and upload an avatar image. The image is then associated with the email address you used to signup with. Now your global avatar image will appear on any site that supports Gravatars. So as you participate in forums, post comments on blogs, and create online accounts, your avatar image will be displayed. Check it out at http://en.gravatar.com/
Gravatar