@Openvatar: Thanks for your comment. I think I understood the way Openavatar works, but I don't understand why I have to upload "yet another avatar". I have defined an Image in my OpenID profile and it would be nice if your service checks if there is any OpenID image to use this instead of uploading another. If you do not, I don't see that Openavatar has any advantages over Gravatar, because its the same system using an URL instead of an E-Mail address, isn't it?