Unfortunately, ibook has always been a dud in New Zealand as we are only able to access a small range of 'free' classics . Similar thing now with ibook 2, textbooks are only accessible within the US of A. As a teaser, there are two interactive books that we can download in NZ. One a pretty picture book with animation is for younger children (the yellow submarine) and the other, and Introduction to life on earth. Both provide good examples of what is possible with interactive books, with a facilities for the book to be read out (yellow submarine) and video and interactive windows/sections (life on earth).
On the bright side, it will be interesting to try out ibooks author to compile interative textbooks. Something we will work on through the next couple of months. The ibooks author app is now downloaded onto the Learning Technologies Unit sandpit Mac and I have emailed a few tutors who might be interested, to try it out.