The Pregnancy Book by Sears & Sears
I liked that it addressed how mom might be feeling physically and emotionally, how dad/partner might be feeling physically and emotionally, what each can do to help themselves/each other, what developmental things are going on with baby, and what things to consider during the pregnancy, planning for the birth and planning for baby. It's also more of an "introduction to attachment parenting" as opposed to "hard core attachment parenting".
Pregnancy, Childbirth & the Newborn by Penny Simkin, et al
I liked this because it gives benefits, risks and alternatives to most pregnancy and birth and newborn testing and has only a light leaning towards what it recommends. It really allows the mom/parent to assess the information and make the right decision for them. It is also quite comprehensive.
The Complete Book of Pregnancy & Childbirth by Sheila Kitzinger
I like this because I love Sheila Kitzinger and her research focus on birth across cultures. The newest edition is probably comparable to the Simkin et al book I mention above. It is perhaps a bit more into the historical basis of birthing in this culture and less about making the appropriate choice for you, but full of great information nonetheless.