Birthing From Within: An Extra-Ordinary Guide to Childbirth Preparation
Yes this book was first published in 1998, but it's one of the best out there addressing the spirituality of giving birth. Birthing From Within offers concrete exercises for mentally and emotionally coping with labor pain. This is a classic (even if it's on the woo woo side of things). If you've been all left brain oriented about your pregnancy and childbirth up to this point, give this book a try. You'll likely find it quite soothing and comforting.