The Free Books app boasts no fewer than 23,469 classics for download (the app costs €1.59, the books themselves are out of copyright). An English teacher can have virtually ever imaginable classic on tap, and a pupil can carry around copies of texts being studied. It's very easy to use, with simple flippable pages; we'd recommend the sepia colour scheme. And of course tremendous value. Coming later in the holidays: the experience of re-reading Jane Austen's Emma (left) via this app on an iPhone.
Download it from iTunes here.