Everyone who owns a Wii should go and buy Zack and Wiki : The Quest for Barbaros' Treasure.
I will start by saying I don't think it is the greatest game ever made, however I will say that it is Fun, Cute, Simple, Challenging, Funny, Pretty and most definitely worth buying. I would be surprised if there is someone who doesn't find something in this game they will enjoy.
Zakuuuuuuuuuuuuuuu!
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Wiki
Looks fun! I love games where they really use the Wii remote's capabilities :)
We're currently trying to get all the stars on Super Mario Galaxy, quite a time-consuming task ;)