Take a look at Mark Anderson's fab blog post about using ipads in education. There will be more stuff coming on this very subject, very soon. Thanks to Mark for sharing - you can follow him on twitter @ICTEvangelist
OK so this is not particularly new, but this is a great directory of interactive books that are available online. You have to have a TES login, but it's free and is a great resource for all teachers. Well worth signing up for!