I've been trying to find this out since iBooks was announced. I like the Kindle app on iPhone, as well as the Mac version. The iPad version looks great. I haven't seen anything anywhere about iBooks being available for iPhone or Mac, which seems kind of dumb to me. With Kindle's iPad app, Amazon now has a big advantage with the ability to read on multiple devices. I know computers and iPhones aren't the best readers around. But I always have my iPhone, which means I would always have my books.