The display assembly of the Nano measures 2.27 mm thick. That's even thinner than the 2.93 mm display on the new iPod Touch and the 3.05 mm iPhone 4 display.

The Nano has a 220 pixels-per-inch (PPI) screen, the highest pixel density on an Apple device aside from the iPhone 4 / iPod Touch 4th Gen. That's almost double the iPad's paltry 132 PPI density!