If you’re a regular commenter here and want to have an avatar with your name in the comments, just go to gravatar.com and signup with your email address you use to comment here with. Then when you leave a comment here on the blog you will see the avatar just like mine in the comments.
For now when you leave a comment, you will get a stock image for the site. Also if you’re a wordpress user and are interested in the plugin for gravatars, you can go here to get it.