In almost unbearable anticipation of the iPad, I installed Kindle for iPhone. The idea is to figure out if I can even manage to read a book on a mobile device. Of course the size of the screen doesn’t blast you away, but it’s actually pretty ok. The ultimative plus is that you don’t have to carry an extra book around: you always have it with you anyway.
Only missing feature: I wish I could either have a dictionary included or at least a copy-word function so I can paste it into my dictionary.
I wonder if Apple makes the iBook app also for the iPhone/iPod Touch. If not the Kindle app has a great advantage: it syncs all your books to all your subscribed devices. So if you don’t have your iPad with you, you can continue reading the book on the iPhone and vice versa.