Thanks to jubol for providing the information behind these.
These look like useful links for identifying and locating ships and their schedules.
NEAT - North East Automarine Terminal
Port of New York and New Jersey
Wallenius Wilhelmsen (yes, this is listed elsewhere, I included it for completeness)
Ship Locations on a global map. If you know the name of your ship, you can search for it (this site is a little slow, be patient)