Metroid Prime, Mario Galaxy, Zelda: Twilight Princess, Paper Mario, Zack and Wiki.
All must have games for anyone who owns (or knows someone who owns) a Wii.
It's too bad Rare are exclusive to Microsoft, otherwise I'd be hyped for another Donkey Kong 64 like game.
On the plus side, a new Banjo KAzooie game is set for release on the 360 next year.