Cinderella Ate My Daughter: Dispatches from the Front Lines of the New Girlie-Girl Culture, by Peggy Orenstein

Fun, thoughtful and well-wrtitten book on the familiar topic of raising daughters in a pink-obsessed world. Orenstein neatly balances research with her personal experiences raising her daughter Daisy, which added a level and warmth and urgency to what can be a dry topic. Not sure why this book has managed to ruffle so many feathers- she writes about the same issues as so many other writers have, but this is the title that has so many people up in arms. Great read, won't change the world, but if you've never paid attention to the issue, this would be a solid place to start.
Other good books, though, on the same topic:
Packaging Girlhood: Rescuing Our Daughters from Marketers' Schemes, by Sharon Lamb
So Sexy So Soon: The New Sexualized Childhood and What Parents Can Do to Protect Their Kids by Diane E. Levin  and Jean Kilbourn
The Lolita Effect: The Media Sexualization of Young Girls and What We Can Do About It, by M. Gigi Durham
Born to Buy, by Juliet Schor