I have enabled Gravatars in the comments. If you don’t have one, you can get one by following the link I provided. Gravatar stands for “Globally Recognized Avatar.” Your Gravatar will be associated with your e-mail address and will appear on every site that allows Gravatars when you leave comments. For instance, Education Wonks uses Haloscan, a commenting system that allows Gravatars. If you don’t have a Gravatar, a generic image will appear next to your comments on websites that allow Gravatars.
If you would like to see what Gravatars look like, just scroll down to a post with some comments. If you select a post on which I commented, you’ll see my Simpsonized image next to my comment.