This is my (moderately long) edited version of the above (long) list:
$1 or $ 2 bills (room service grat)
Address book/e-mail list
Anti-bacterial Wipes or Gel
Aspirin/Tylenol or other medicines/prescriptions
Backpack or canvas tote for each adult
Band-aids
Batteries (camera batteries also)
Beverages/mixers/wine
Bonine/Dramamine
Books
Cameras
Candy/Gum
Candy sprinkles for ice cream
Carry-on with wheels
Deodorant
Disney Gift Cards
Duffle bag (spare)
Earplugs
Extension Cord or Power Strip
Fanny pack
Feminine needs
Film/Memory Card (spare)
Flashlight
Flavored coffee creamers
Glow necklaces/sticks
Hairbrush/Comb
Highlighters
ID holder/waterproof box
Insect Repellent packets
Lanyard and ID holder
Laptop & cords/chargers
Laundry Detergent
Magnets for door
Makeup
Notebook/Journal, Pens
Notebook/Memo Pad
Pillowcases & colored Sharpies (no yellow)
Pirate accessories
Post-it Pad
Reading Glasses - spare / prescription of glasses
Scrapbook/Autograph Book
Sense of humor
Shaving Kit
Sippy Cups/cups with lids
Snorkeling Gear (at least a mask - for Carribean)
Sports bottle/water bottle
Stain Stick or Packet
Sunglasses
Sunscreen/Sunscreen spray
Toothbrush/toothpaste
Tote Bag/Beach Bag/Day Bag
Travel clock/alarm clock
Watch - recommend waterproof
Ziploc Bags - a few sizes
We didn't need the extra storage space of over-the-door hangers and laundry pop-up hampers. Actually, we didn't really use the plastic cups because we mostly used the ones at the drink bar. The extra bags were good for all the toys/snacks we collected and wanted to bring home, or even to take off the boat at ports (where allowed).
That's my $00.02!