Nintendo Wii Must Have Games

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What are the must have games for the Nintendo Wii? I will be getting one very soon. I am actually a playstation fan (have a playstation 2 and playstation 3) but for some reason I am drawn to the Wii. So I would appreciate any suggestions. I am actually looking foward to Wii Sports. I've seen people make demonstrations over youtube and it looks like a ton of fun!