This list is curated by Jeff Piontek, "an author, keynote speaker and teach".  Jeff has curated a number of Literacy and iPad Learning Apps for younger students. This is a list that has an app for all types of kids. It has pre-reading apps, word recognition apps, starting to read apps as well as poetry and story telling apps. Well worth a look.

http://jeffpiontek.com/2012/05/31/literacy-and-ipad-learning-apps/