Active Birth: The New Approach to Giving Birth Naturally by Janet Balaskas (1992) argues that movement and positioning during pregnancy and labor can have a huge impact on the birthing process. The first part of the book explains the physiology behind why certain positions during labor and birth hinder the process while others help. Then the middle portion of the book explains a series of yoga exercises and stretches (with helpful photos) that can help strengthen and prepare you for giving birth. And the last part of the book gives practical advice on what to do during labor-- including what to do if you choose to get an epidural-- and how to help accelerate the healing process after birth.
I felt that overall this book was much more useful to me than Ina May's book. I plan on using the exercises and advice about how to stay comfortable during labor. And I liked that this book didn't make me feel like getting an epidural would be evil, since depending on my situation I may choose that option.
I would definitely recommend this book to any pregnant woman-- whether she is planning on a hospital birth, home birth, or water birth, and whether she is planning on a medicated birth or not. My only caution is that this book has many graphic photographs of completely naked women giving birth. Why, oh why? To me birth is such a private sacred thing, I don't think pictures are necessary. But other than that, I think this book is great. I plan on reading long sections of it to Brent.

