If you are a regular commenter on my blog then you might be interested in this system called Gravatar.
Once you signup and upload an image of your choice, Any blog you comment on, Using the same email addy that you signed up for with Gravatar, Will display your uploaded image.
From the site (and explained in a far better way)
“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?”
My blog is now Gravatar enabled so why not get yaself one? 🙂