astracan

I use this to show Gravatars and link to post authors in the sidebar:

In function.php…

function get_the_avatars_with_link_to_authors(){
	$authors = get_users_of_blog();

		foreach ($authors as $author){
			$author_data = get_userdata($author->user_id);
			$author_nicename = $author_data->user_nicename;
			$author_displayname = $author_data->display_name;

			$link .= '<li><a href="' . get_author_posts_url($author_data->ID) . '" title="' . sprintf( __( "Ver post de %s" ), $author_displayname ) . '">' . get_avatar($author_data->ID,$size = '64') . '</a></li>';
		}

	return $link;
}

In sidebar.php…

<ul>
          	<?php printf( __( '%s', 'libra' ), get_the_avatars_with_link_to_authors() ) ?>
          </ul>

Not the same, but I didn’t find out a solution in WordPress Forums to do what I need.