You can do a (paid) online rental at the documentary's website.
I've seen it several times and I thought it was pretty good overall. I thought the ending was confusing and contradictory (we talked about this at length in another thread in pregnancy club, probably 3 months ago.) Things like, because of her dates it would be illegal for the mw to attempt a home birth, and was it IUGR or just the fact that the baby was early, and so on.
I thought there was some good information, but I thought they could have done such a better job too portraying both the home birth advocates as well as the doctors.
I also watched Orgasmic Birth recently and thought it was interesting as well. I think the title is just for shock value, and the births they show on there actually look less comfortable than the ones on the Business of Being Born.