A friend asked me a couple of days ago why some people have avatars in my comment sections, and some folks don’t. A fine question!
This site uses Gravatars, globally recognised avatars. These are avatar pictures tied to the email address you enter in the comment box, and a great many sites use them now. By setting up your gravatar, your picture will follow you around the internet with no effort at all!
You can set up your free gravatar over at Gravatar.com.