If you used to have a photo attached to your profile you'll probably have noticed that it's been missing for a while. It seems the directory where profile photos are housed got eaten one night by the profile photo gremlins. In any case, the problem is fixed now and you can upload a photo to your profile. And if you've never had a profile photo, this would be a great time to upload one! (You do this by heading over to your "my account" area and then using the "edit" tab to change or add stuff. Profile photos can be no larger than 85x85 pixels and may not contain images that violate any laws.)
Profile photos don't show up with all your posts. Yet. But they do liven up your profile page, so have fun with them!
...because public space really matters!
Elizabeth