Apple ipod touch is looking amazing because of Retina display. This makes images and movies pop off the screen. Text in pdf, email and web pages is crisp at any size. This is because Retina display pixel density is very high and our eye is unable to distinguish individual pixels. The pixel size is mere 78 micrometer. Normal screen will be 72 pixels per inch but Retina display has 326 pixel per inch. This otherwise called as dots per inch (dpi) in printing technology. Pixels per inch (PPI) and dot per inch (DPI) are analogous but not same. Apple has included LED backlighting and an ambient light sensor that automatically adjusts to the ambient brightness.
Good quality magazines will have 1200 DPI. That is why always images in magazine will be very stunning.
Please check the live demo in the following website. That will help to realize yourself.
http://www.apple.com/ipodtouch/features/retina-display.html
