Interactive Childrens Books

I have seen a lot of "leapfrog" and "tag" reading programs advertised on TV lately... but are they really more beneficial than reading tangible books we know and love? I think it is really neat that you can put a pen over a book and it will read it aloud to you! This can be extremely helpful and exciting for young children who struggle with word identification or decoding. The TAG program states "children will learn to read, and love reading!" I can definitely see how children can learn more and be more engaged with a book that is interactive and exciting. Many children learn better when they can hear what is being read, nut just look at it. However, interactive books can also become a problem if students become dependent on the pen in order to figure out what a word says. I think these programs are more beneficial and less harmful if used by younger children who are learning to read. I'd like to learn more about interactive books and see how they have been beneficial (or not) in children's literacy development.