Up The Duff achieves what it sets out to do which is to be a light-hearted funny read about pregnancy. I don't think it intends to be a good guide to labour/birth and certainly if it does, it fails miserably. But it's also a great one for blokes to read.

That was pretty much all I read about pregnancy apart from a few magazines here and there.

I also read Juju Sundin's book, sorry, can't remember the name about labour. It helped me enormously because her approach is to give you a whole heap of pain management skills and if you know you've tried your best in labour, then you can't be disappointed. I found that philosophy VERY important as although we all like to plan as much as possible, you can't predict how long your labour will last and hence what pain relief you may feel necessary at the time if you have say, a three-day labour as opposed to an 8-hour labour.

There is so much here on BB that I found I didn't need to read any books apart from those.