I downloaded the Life on Earth Intro as well and must say I am underwhelmed.
The ebook weights it at a hefty 998MB most of which is wasted on a few videos (including the dull intro). The actual text with information is really short and simple, not enough for even a highschool textbook in my opinion, but maybe I am being two critical here.
I hope a lot of publisher jump on the band wagon and get something going ..
T.
What's the title of YOUR interactive textbook, or are you just complaining because a free demo wasn't enough for your high-end needs.