Ladies and gentlemen, boys and girls, let's give a big waterfront welcome to our newest arrival, the world's largest cruise ship: the Queen Mary 2. She sailed into New York this morning, accompanied by an entourage of buzzing helicopters and spraying fireboats. Hundreds turned out along the Hoboken waterfront to watch her maiden arrival, although some of those were commuters too engrossed in their morning papers to bother looking up as history passed by.