Nice idea to move into a portable profile that can be used to identify yourself into different weblogs. It allows to store your profile remotely and link it to each contribution you do in weblogs that support it. We should really get a gravatar. Besides this can raise some discussions on private contributions and reliability of such information.
A gravatar, or globally recognized avatar, is quite simply an 80×80 pixel avatar image that follows you from weblog to weblog appearing beside your name when you comment on gravatar enabled sites. Avatars help identify your posts on web forums, so why not on weblogs?