Any reasons not to hold out until the Wii U comes out? Or do you really want the GCN features?
But in anycase:
Kirby's Return to Dreamland
Sonic Colors
Zack & Wiki
Rune Factory: Tides of Destiny (Unless you have a PS3)
Sengoku Basara: Samurai Heroes (Again see above)
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Oh brilliant blade of cold as steel, rend the infinite darkness and crush my enemies to nothing... SAVAGE WOLF FURY