Yes, iTunes 9.1.1 has a Books section in the left hand column where your book collection is stored, which replaced Audio Books that was there previously. However, there is no Books section in the iTunes store if that is what you are asking.
If you have iTunes 9.1.1 and don't see Books in the left hand sidebar, perhaps check your iTunes options where you can turn on/off the different categories which appear there. I am in Canada and I've had it there since 9.1.1 was released.