So far, anyway...
Ina May's Guide to Childbirth, by Ina May Gaskin (This is a must-read-- seriously amazing.)
Active Birth, by Janet Balaskas (also great)
Natural Hospital Birth, by Cynthia Gabriel
A Thinking Woman's Guide to a Better Birth, by Henci Goer
Pregnancy, Childbirth & the Newborn, by Patty Simkin, et al
The Baby Book, by William Sears and Martha Sears (This one's gotta-have.)
Magical Beginnings, Enchanted Lives, by Deepak Chopra
From the Hips, by Rebecca Odes and Ceridwen Morris
FOR A LITTLE HUMOR:
Pregnancy Sucks, by Joanne Kimes
Belly Laughs, by Jenny McMarthy
Becoming Attached, by Robert Karen (This book isn't what I was expecting-- it's more a history of attachment theory than a how-to on attachment, but it's riveting.)
Momma Zen, by Karen Maezen Miller (I loved this book-- it's beautiful and inspiring.)
I've got a whole stack of books to go, so I'll fill you in as I read...