I would have included them, but the problem is that Heart Pieces appear in several Zelda games, and I was focusing more on collectible items that were unique to a particular game.
Starting with Link's Awakening, there have always been items in each Zelda game that either granted odd powers, or that would allow you to get an upgrade once enough were collected.
What is your favorite collectible item from the Zelda series, and why?
My favorite would probably be the masks...