Waitlisting did work for us. In March we attempted to book a Silver Suite on Silver Shadow for its 9 night cruise out of Barbados on 12/12/2006. Our TA was only able to book Medallion Suite 735, with us waitlisted for a Silver Suite.
About two weeks ago, he contacted us and told us that we were now booked for Silver Suite 724. We thought that we would not hear on our chances until final payment date in September. Obviously, the news brought a big smile to my DW's face. On the cruise critic forum, various posters were some negative on our chances.