I've been stocking up for launch: Super Mario Sunshine, Zelda: Wind Waker, Metroid Prime, and a wireless Wavebird controller. Should augment my Wii experience during the first few months (I don't have a GameCube so I will be taking full advantage of its backwards compatibility...).
Most of the launch titles look great anyway. If either Zelda, Metroid, or Super Monkey Ball are among my free game selection, I'll choose them (of course, the choice of all three is gonna screw me up big-time!).