"From the beginning, a major challenge of working with iPads is actually working with iPads. Unlike a computer, there are no multi-user logins, no file structures, and no easy way to share these devices with multiple students. Additionally, in elementary classrooms the challenge becomes even more difficult. Students don't have email addresses. The Terms of Service of many cloud storage options preclude those under the age of 13 from having an account, and devices are often shared. So how can teachers easily distribute content under these circumstances? "
Via John Evans