Nobody ever says, "Madonna who?" She's part of our culture, an American success story who's maintained a media presence for 20 years now, re-inventing herself with every prevailing wind, while never, ever giving the impression she's doing anything other than what she wants to do. We are by turns impressed, embarrassed, shocked and amazed by Madonna's antics, but we're rarely surprised anymore. Madonna, the dancer from Detroit, set out to become famous and succeeded beyond anybody's but her own wildest dreams. She's 45, and shows no signs of slowing down or relinquishing her place in the spotlight; in fact, she's...