This is pretty cool news - Amazon has released "Kindle for iPhone" software (I'm installing it on my iPhone as I write this). This part of their explanation is interesting to me:
Mr. Freed says he expects that users of the iPhone application would read their books for 20 to 30 minutes at most, after which eye strain or battery life might become a problem.
I don't know about that. I installed the "Classics" application awhile back, and I've been using it to read "Huckleberry Finn". Doesn't give me any eye strain, and battery use seems to be no worse than using any other application.
This is almost what my wife really wants - she wants this kind of software directly on her Macbook, because she'd like to have all the media she consumes in one place. Looks like all of that is getting pretty close.