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Display a User Gravatar from an Email Address

<?php
  $gravatar_link = 'http://www.gravatar.com/avatar/' . md5($comment_author_email) . '?s=32';
   echo '<img src="' . $gravatar_link . '" />';
?>

The variable $comment_author_email would be a string of a valid email address. If the email isn't in the Gravatar database, it will return a default graphic. $comment_author_email is the default WordPress variable that populates from a cookie for people who have previously commented (if the theme supports it).