Treasure Ketch:
Duty free perfume
Jewelry - Disney and non-Disney, mostly sterling silver and 14kt
Watches - Disney and non-Disney, TAG, Swiss Army and a few other brands
Clothing - some Disney better clothing and a few designers, bathing suits for men and women
Collectibles - very few but they are there
Posters - ship related
Small selection of necessities, suncare products, baby products (very few), film, batteries and magazines
Mickey's Mates:
Cruise logo items - ornaments, photo albums, mugs, pens, shirts, luggage, photo frames, and I'm sure I left out a few items
Costumes - Disney characters for boys and girls
Toys - various Disney toys
CD's - music from the movies mostly
Sunglasses
Bathing suits - boys and girls along with sandals for children and adults
Pins - lots of them, some ship exclusive and some 'rack' pins
I'm sure there are a few things I forgot. In case you can't tell, I spent A LOT of time in the shops and we haven't been on the cruise in over a year.
You won't find park related merchandise or housewares, but lots of ship related stuff.
Happy Shopping
p.s. I forgot about Shutters and the Spa
Shutters not only sells the photos they take onboard but also cameras.
The Spa sells their products but I don't know what lines since I haven't been there.