Yes! Childbirth Connection, a US-based NPO, surveys moms annually about their childbirth experiences. Their reports, "Listening to Mothers," might be a good place to start: http://www.childbirthconnection.org/article.asp?ClickedLink=205&ck=10068&area=2. Good luck!
I hope your project has gone well, am looking at if women feel they have a choice of birthing place. I have look at the Birthing Project, did you look at this? any advice you can share?