Authors are attributed by either 'Visitor' or 'Admin' after a comment. This is sometimes not a very useful thing. I turn it off by editing two lines in the core file _comment.class.php like this:

	if( $this->get_author_User() )
		{ // Author is a registered user:
			if( $params['after_user'] == '#' ) $params['after_user'] = ''; // this line has been edited

			$r = $this->author_User->get_identity_link( $params );

			$r = $params['before_user'].$r.$params['after_user'];
		}
		else
		{ // Not a registered user, display info recorded at edit time:
			if( $params['after'] == '#' ) $params['after'] = ''; // this line has been edited

			if( evo_strlen( $this->author_url ) <= 10 )
			{ // URL is too short anyways...
				$params['link_to'] = '';
			}

It would be nice to have this as a switchable option.