For partners, I highly recommend, "The Birth Partner". Excellent book, but more labor focused than pregnancy focused.
I also enjoyed "The Mother of all Pregnancy Books", mentioned above.
Also thought "What to expect" is pretty fear mongering...
All the said with the caveat that, while I have been there for the pregnancies of family and friends, and some labors, and done an OB rotation in nursing school, I, myself, have never had a kid. So grain of salt I guess?