Everyone’s excited about the new iPhone “Retina Display”, which has 960×640 resolution. That’s about 326 dots per inch (dpi). Most desktop monitors give you 100 dpi or less, so it’s a great improvement.
The iPad is a 132 dpi device. When it, and other ebook readers, start to approach the print quality of a smudgy newspaper, maybe we’ll be able to read the damn things all day without squinting and getting headaches.