Anything by Jason Evert is automatically on my recommendation list. This is a favorite though because it is realistic, thorough, and geared for today's parents.
A fun approach to talking to your daughter. This is a hands-on manual for having those important talks with your daughter and getting in some quality bonding time as well.
Girls are under so much pressure to grow up. If you read the classics like Little House on the Prairie or Anne of Green Gables, you will realize that being 9 or 10 was still a time of being a little girl. This book is another hands-on guide to simple things any mom can do to protect her daughter's innocence and let her enjoy the full length of her childhood.
This is similar to the "dates" book, however it is broken into age categories and works to create an on-going conversation between mothers and daughters about the most important topics. This is a great book for moms of girls from preschoolers to teens.
Gregory Popcak is another of my favorite authors. In this book, he not only explores how to have "the talk" with your kids, but he helps you lay the all important foundation for raising children with Godly views of sex and relationships. Like the "Conversations" book, this book spans all of childhood through teen years.