I know Splendor had a future cruise desk (or whatever). They were offering $100 OBC certificates for a $100 deposit towards a future cruise whether you booked something or not. I'm sure they were also booking actual cruises too.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Alaska 2014 - haven't picked a cruise yet
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012
Celebrity: Summit 2011
Princess: Ruby 2010, Caribbean 2013