A year after the Yachts of Seabourn announced that it would build two ultra-luxury ships, it has announced plans for a third. The decision to add another ship, to be delivered in summer 2011, was prompted by advanced booking activity for the Seabourn Odyssey, which makes its debut in June 2009 as the first in Seabourn's ultra-luxury class. The second new ship is scheduled to enter service in summer 2010. Visit [www.seabourn.com]. (MA)