Wow, I never knew about Gravatars until just now.  Everyone needs to go to and register an avatar that can be used across the web on many websites (including this one).  The avatar is associated with your email address and if a website uses Gravatar it just checks to see if you have one setup on  If you look at comments on this site you will now see avatars.  This is a really amazing idea!

Now if you have a wordpress blog and you want to incorporate Gravatars into your template, I suggest you use this line of code in your comment template.

  echo get_avatar( $id_or_email, $size = '96', $default = '<path_to_url>' );

Replace $id_or_email with $comment (this is what I used) or with get_the_author_id() (it varies from theme to theme), replace XX with the size you want the images (I use 50 pixels), and replace '<path_to_url>' with the absolute location of a custom default avatar (in the case that the commenter didn't have a gravatar set).  If you want to use the default avatar set in the Wordpress settings (Settings->Discussion) you need to remove the default argument completely.

Hope this was educational, and remember to sign up for a Gravatar!

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