We are in the process of discussing with Blogger the possibility of adding a gravatar template tag to their arsenal.
Until then, however, there are a few third-party commenting systems you can use instead of Blogger's built in commenting system.
blogkomm supports gravatars and can be installed on your server and included in your Blogger templates.
HaloScan supports gravatars and is a hosted solution that you can use on any page (including Blogger posts).
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