Comparing the Retina display of the new iPad with the display on the Apple iPad 2 shows how much smaller the pixels are on the new device. The number of pixels on the new tablet are quadruple the number on the previous version of the tablet.
Check out the images below and you will be able to compare the new iPad's Retina display with the display on a 2007 Apple iPod Touch, the BlackBerry PlayBook and even an HP Veer! It might all look like DNA under the scope, but because a picture equals a thousand words these pictures certainly tell an interesting story about why images look better on certain devices than on others.
source: Ignorethecode via RedmondPie