Thanks so much for the info! We flew USAir last time and they were set up at the port, too! It's amazingly simple.
Padre, the port check-in has nothing to do with Disney transfers as far as I know (someone correct me if I'm wrong). I believe as long as your airline has a kiosk at the port, you can check your bags there. The ones I remember from last year are American, USAir, Delta, Continental and maybe Southwest (?).
Michelle