One of the ways that I've been using the iPads the most, is in centers.
So, I share a no prep center (aren't those the best ones? Just bein' honest!).
Our reading curriculum provides retelling cards. They're great and necessary, but to put the kids at a center with them just doesn't work. They're done in 5 seconds flat. Enter iPad. Now they have to lay them out in order, practice their retelling, then they get to video each other doing the retelling. I can watch each child's video to assess them. PRESTO, instant, engaging, common core aligned center!
Blessings to you,