If you are wondering what games after the purchase of a Wii needs, I suggest you ...
... for solo players:
The Legend of Zelda: Twilight Princess (Absolutely!), Super Mario Galaxy, No more heroes, trauma center, Okami (tip), Metroid Prime 3, de Blob, Wario Land The Shake Dimension and Super Paper Mario. And Resident Evil 4 when you use it on the Gamecube has not yet.
... for the party fun & Internet Gamer:
Mario Kart Wii, Wario Ware Smooth Moves, Mario Strikers Charged Football, Super Smash Bros Brawl, Animal Crossing and Big Brain Academy.