mandarian oriental reservations?
It wasn't loading properly when I tried when it opened up at midnight New York time. I got as far as where it shows what room types are available (I picked a weekday).
It's pretty/very lame that the dinner reservations come with a mandatory stay at the hotel. Also, very hard to score a 4-top since it would require 2 people to SUCCESSFULLY book on the same day. Very low odds.