There is only one book that deals with the holdless (As they're called in Pern),  Renegades of Pern.  It deals with all the underside people who get ignored by the heroic fantasy aspect of most of the series.  Needless to say, its my favorite :)<br/><br/>FYI,  menial servants are called 'drudges', and are common and generally looked down upon also.<br/>