The Thinking Woman's Guide to a Better Birth by Henci Goer was my handbook for my previous pregnancy and this one. I think that's the best book if you're the "sciency" type.
Ina May's Guide to Childbirth was really upsetting to me. It's beautifully written and inspirational...but ONLY if you have a low-risk pregnancy. It made me feel like a healthy birth in a hospital environment was unattainable. I caution any of my high-risk friends away from Ina May, especially if their risks make them ineligible for midwifery care in my state.
Our Babies, Ourselves: How Biology and Culture Shape the Way We Parent by Meredith Small was FASCINATING. I have an interest in anthropology and parenting, and this was a fascinating look at parenting from an anthropological viewpoint.
If you're interested in more baby science/anthropology, also check out NurtureShock: New Thinking About Children and Brain Rules for Baby: How to Raise a Smart and Happy Child from Zero to Five.
Raising a Happy, Unspoiled Child by Burton L. White was a lot longer than it needed to be, but I used the suggestions in it and feel like I've managed to raise a delightful almost-3-year-old so far. You can skip reading the book though---here's everything you need to know from it:
1. from 5.5 months until crawling (approx 7.5 months), initiate social interaction & keep baby entertained.
2. From crawling through "me, mine, no" (approx 14 months) allow extensive home exploration, don't fuss over minor injuries, punish by restricting movement (pin arms for 15-30 seconds).
3. From 14 - 22 months, baby will be testing limits (ie power struggles). Give baby lots of opportunities to make decisions, pick your battles, calmly/patiently assert authority and dont back down. Punish by banishing child from interacting with mama, but not a "time out."
I read several breastfeeding books (The Womanly Art of Breastfeeding, Ina May's Guide to Breastfeeding) before my son was born, but honestly breastfeeding is SO individual and instinctual...I think a person could skip reading anything other than "Join a breastfeeding support group (Facebook, internet forum, La Leche League, whatever). Do what comes naturally, and when in doubt ask your support group. Know that almost ALL breastfeeding hiccups can be overcome w/ the right support."
I'm also doing the Hypnobabies Home Study Course, so I'm reading the materials associated with that.