Why doesn't iBooks save my place between the iPhone and iPad?
iBooks uses your iTunes account to sync bookmarks and places.  My wife and I share an account for app and book purchases, so I setup a separate iCloud account for her thinking that her bookmarks would go there.  It turns out that I'm wrong, and it's the iTunes store account that stores it.  I wish iCloud was the storage location, since the other app settings and backups do work using separate accounts.