Wow, good thing I put it up to a vote, because I was leaning heavily towards Oracle of Seasons. That's my favorite handheld Zelda game. I don't care for the DS or GBA Zeldas.
Looks like I'm going to be doing Legend of Zelda: Twilight Princess! Let's hope my GameCube recording equipment still works. I wrote a text walkthrough for Twilight Princess when it came out, but I remember little to nothing about the game.