Have to say thought the "Wonderbook" was a bad gimmick when I first saw it but it really seems to have some potential.
That Dinosaur book was really interesting and has some neat potential. To be able to go to different areas of the world, look at the dinosaur they found there, and then interactively dig out the fossils is a really great learning tool for kids.
Yeah, the E3 segment on wonderbook was terrible. I'm not in the "entertaining" kids portion of the market" but gamescon shows that it could do pretty decent this winter.