I went to the Apple store to learn about this product. Thankfully they were very helpful.
Two that I found that could work in a group setting were Toddlers Flashcards and Preschool Adventures. Our school is getting more and more ESOL students from foreign countries. This would be a great way to introduce some of the vocabulary they would need for reading. You could have them show it to you or read what they find. Both apps would allow a great medium for kids to learn something basic. Also the books section might have easy readers. Shared reading could take on a new look-cool!!!!