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Seems more easy, >>http://site.gravatar.com/site/implement says use a <img src="http://www.gravatar.com/avatar.php?gravatar_id=<%= MD5( email ) %>" alt=""> will show the image which saved at gravatar.
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Hmmm yes... Although like that you are making the user create a gravatar account to be able to use avatars. Maybe the two implementations, for the ones who want to use gravatar and the ones who don't.

My only problem with gravatar is when do I know that the user really wants to display the avatar? Or it's like a feature on and off, Show avatars Vs Don't show avatars... Maybe this last option is the best approach, at least for now. After having avatar support, we can elaborate more on it.