Baby Catcher - Chronicles of a Modern Midwife will really get you amped to give birth too. I've read it several times and I always feel like a junky in need of a birth fix afterward. Gentle Birth Choices is also an awesome one.
I could recommend a zillion books...I almost sent Alice home with about 30 yesterday but she cut me off at 4 I think, and then I snuck in another one hahahaha.