The iBooks store has finally 'arrived' in New Zealand. While the app has always been available, the purchasing of books was not an option. This has now changed and while not all publishers have their content with iBooks, there is a good starting range. There is also a range of self-published books, created with iBooks Authors. These self-published books include textbooks, recipe books, children's stories etc.
The release of iBooks 3 has seen alignment with iCloud so that your notes, bookmarks and placemark is synced across all your ios devices.
It is worth browsing the iBooks Store if you haven't already. You might like to check out the free sample of Life on Earth, a multi-touch interactive book that showcases the future of textbooks.