Dear Mikey Sr:
You've already gotten great advice on cruising with a two year old. Keep in mind that Disney Cruise Line's nursery program for those under 3 years is for a fee and that you have to reserve your hours when you get aboard ship. We had our infant check it out last year and were very pleased with the facilities and staff.
Otherwise, Carnival and NCL are your only other choices (except for Cunard's QE2 nursery).
Let me know if you have add'l Q's.
Luisa Frey GAynor
Family Cruise Editor