If you're not a girl who loves dolls, you might want to stay far, far away from the Mall of America rotunda on Saturday, when American Girl opens its flagship store. It's going to be big. Very big. But there are some other noteworthy openings at MOA in the coming weeks: Columbia opens its first company store outside of headquarters in Portland on Nov. 21 (why, you ask, when you can buy a Columbia jacket virtually anywhere? Advertising). Also opening next week: NikeStore, American Apparel and True Religion. Not bad, MOA.