The wishlist is the page that shows other users what pets from the game you want, need, or are missing.
You can find your wihslist here:
http://www.chickensmoothie.com/archive/wishlist/And you can browse the Archive for pets you'd like to add here:
http://www.chickensmoothie.com/archive/. Just choose a year and go through. The Archive will tell you which pets you're missing, and you can add the pets you want.
When users trade with you, they can see which pets you want to trade for, and you can see if they have any pets from your wishlist in their trades.