It's the first time I've seen my girlfriend buy a game for herself. She got both Just Dance 1&2 (Gamestop had a special when you buy both). Since there's extremely little for the ladies and about half of Wii owners are female, that's a huge market Ubisoft has mostly to itself currently.
Now if they can resist the urge to over-milk it (unlikely), they could keep on selling for another couple years.