I just booked our 1st cruise using points on Friday. The points in the charts are per person for the entire cruise (not per night), based on double-occupancy and apply to 1st/2nd Passenger. They include Stateroom accomodations, food and entertainment. Additional passengers in the the same stateroom require less points...
Total points cost was 494 for 4 of us (161 for DH, 161 for me, 86 for DD, 86 for DS) We only have 225, so I had to bank and borrow. I already had some banked due to the Developer pts we received when joining (used those for our 2008 trips) and then borrowed some, still leaving some for a small vacation the following year.
There are many opinions on whether its wise to use points for cruises, but we'd never pay the cash for a trip like that, so pre-paying the points will allow us to pay once, then only have to save up cash for the extras on the trips...