Greetings, Devil Dog! Welcome to the Call of Duty Forums. It looks like you're looking forward to Call of Duty: Modern Warfare II, but haven't created an account yet. Why not take a minute to register for your own free account now? As a member you get free access to all of our forums and posts plus the ability to post your own messages, communicate directly with other members and much more.
IIRC Shoot the Ship was a selection game modes played on Shipment and Shoot House, with a rotation of:
Team Deathmatch
Kill Confirmed
Cranked
Grind
Domination
Hardpoint
Headquarters
Both maps are good for frantic close quarter combat, and rapid game play, both maps are good for levelling up a lot of weapons too, which is why they tend to be very popular.