RCL did pull the Serenade from Alaska for 2010. That might have something to do w/ it. One less ship sailing.
Also the Olympics are in Vancouver in 2010. People might be making it into a dual vacation.
RCCL Serenade of the Seas
Cruise lines will never make all their inventory available online. It's considered a trade secret. Otherwise CCL could simply log in and see how well they are doing on their sales. Your agent (or you) must call in to ask for a specific room.