School leaders around the United States continue to spend HUGE amounts of money on interactive whiteboards for classrooms, despite the fact that these devices universally FAIL to empower students to become more independent, self-directed and engaged learners in the way mobile learning devices (like laptops, tablets or other personal digital learning tools) can. Please do not misunderstand me: It definitely IS a big deal for a teacher and his/her students to have access to an LCD projector connected to a computer in the classroom if previously, the "normal" technology in the room was an overhead projector.
Student portfolios, shared class accounts or student accounts, note sharing between accounts; use for conference notes with recordings, photos of student work and your notes. Create printable, formatted documents from an app that is accessible from mobile and desktop devices.
Apple has also announced iBooks Author (more details below) which lets you create your own textbooks. Users can even insert custom Javascript or HTML5 code into eBooks using iBooks Author.