Julia DeVillers, author of Girlwise: How to Be Confident, Capable, Cool and In Control
This is not just proscriptive advice, although there is a lot of that too (e.g., "how to tell if she's had a party while you were away"). One thing that really impressed me about Wiseman's approach is that she gives parents an entire way of approaching problems that they can share with their daughters.
In other words, she doesn't tell you what your rules should be (she leaves that to YOU, thank goodness), but she does tell you how to get your daughter to think about why you as a parent have created them and your family's values should mean to her.
A second thing that really impressed me about this book is that it is wholly non-judgmental: it does not divide girls into Good and Bad/Mean. If your daughter is a Queen Bee, Wiseman knows she has problems too, and she helps you figure out how to solve them.
For more conservative parents, it's worth mentioning that this non-judgmental approach extends to issues of sexual orientation, including homophobia and same-sex attraction. Other reviewers have been rather upset by this, but keep the problem in perspective: out of 288 pages, I counted 4-5 that discussed homophobia in boys and another 4-5 around issues of same-sex attraction. That doesn't seem out-of-proportion in a 200+ page book if something like 5-10% of our daughters are gay. Wiseman's opinion on the subject is clear, but fundamentally she is arguing in favor of parents' right --and NEED--to communicate their own family values to their daughters.
My daughter is only 3, but I can already see the social structure that girls impose on each other -- when she comes home saying "So-and-so says she is not my friend anymore." I am very grateful to Wiseman for giving me a headstart toward providing her with a healthy adolescence.