So...how exactly does this thing work?
Get a picture of yourself (or other people like I did) that's AT LEAST 640x480 pixels, and that's of a close-up head shot that's in color.
Upload it, and select the basics while the image is being processed: gender, skin color, age, type of hair, type of clothing, facial hair if any.
Then if your image is approved, it's "Simpsonized", and then the picture is tooned-up to make you or whoever look like a Simpsons character.
Then comes the fun part: deciding on the facial expressions, different kinds of eyes, ears, noses, mouths, glasses, piercings, accessories, clothing, etc.
Then you can download the picture, e-mail it to someone, or download it as an avatar.
Voila.