Rune Factory Frontier. Buy it. This is hands down the best RPG on Wii right now.
Edit: Don't mean to plug but I figured I'd back up my pick with some info. We've been covering the game pretty extensively on Siliconera:
Rune Factory Frontier: Returning to the Farm
Rune Factory Frontier: My...
if they get permission from 4j (the studio who helped put minecraft on consoles), they could put the console edition tutorial worlds in the game, as seeds
and i mean all of them (if not, maybe a few highlights, like TU1, TU31, and TU69)