Mine loved Animal Crossing at that age, and I really believe it helped with their reading too.
Other than that, there are a couple of Bratz games available (I know, but they like that stuff
)
Super Monkey Ball was fun, but got hard.
WarioWare - mini game madness
Mario Party - There's a series, I think we have 6 or 7 (poss 5?) and it's a series of mini games, which again, they loved
Mario Kart - yes it's a racing game, but my daughters liked it lots.
Mine weren't too fussed on Harvest Moon, I think it's cute looking & could be fun, but the children never really bothered with it much, they think it's "okay, but a bit boring"