[jsz0]

By natural light do you mean direct sunlight on the screen? That is a problem but otherwise the iPad is usable outdoors in most situations I've found. I used it in a car the other day (no, not while driving) with lots of sunlight coming in the windows and it was usable. Definitely not up to par with an e-ink display but for someone like me who has no interest in a dedicated e-ink device it's certainly good enough. I don't think there's much doubt e-ink readers will be the choice for heavy readers. Of course we also don't know how many iPad owners bought the device with the intention to read books on it. We know about 99% of Kindle owners bought their device for one specific purpose.