The field of interactive children's eBooks has become quite sophisticated over the last number of months. Products from Oceanhouse Media and My Black Dog Books are quite impressive and offer children four years and up a satisfying interactive experience as they traverse their way through well-designed stories with lots of animation and variations to keep things interesting. It's become the norm that when a child taps on something in one of these books, he or she gets immediate feedback on the item of interest.
3-Little Pigs (US$3.99) for the iPad is a major step backward in a field that has been constantly improving. When I first downlo