My poor mother got me one of the Ezzos books for a present, not having read it but on a friend's recommendation. She gave it to me while my sister was around and we both told her just why it was so awful (if you haven't heard of it, it's nothing like anything you have in the UK, it's seriously insane, basically keeping kids like pets in a pseudo-religious way). We decided it shouldn't be donated away and was buried in the trash.
My ob for my first son endeared herself forever to my husband with the answer to my question of "What books should I get for pregnancy and having a baby?". She said, "NONE! Don't get any. None of them will apply to you."
And then my pet hates are (since, of course, I refused her advice): Dr Sears (he who had a huge formula maker advertising on his website-- but that's not why I hate him, it's mainly for his advice), Penelope Leach (although she had lovely pictures) and the What to Expect (ie Why You're Doing It Wrong) series.
Husband input: I hated the Penelope Leach book even more than the Sears book. I actually thought the Sears book, unlike the Leach tome, had some useful info. Once you get past the Sears outlook that you and all 300 of your children should sleep in bed together until they go off to uni you can pretty much recognize the bits where he just flakes out and ignore those. Leach just seemed batty and useless. Favorite example is her suggestion that, for a fussy or cholicky baby you simply put them in a buggy in your kitchen while you're running the household and talk cheerfully to them. Yes, brilliant. Thanks, Penelope.
(and that was my husband, folks)
The one I found helpful was the American Academy of Pediatrics book (not great parenting advice but ideal for when you should ring the doctor type advice). That book is still in heavy use.
With son number two I didn't buy any new books and disregarded every piece of advice from the previous go around. Whoever said that breastfeeding prevents allergies should be shot. That's just me, though. The best advice ever was my next door neighbour telling me how ridiculous books were.. "You wouldn't say that all people do this or all people do that, would you? You'll figure it out." She had two small kids, so I was happy to hear that.