The iPad mini is thin. Apple made a big fuss about it. Every review makes a big fuss about it. And they're all right - it's amazingly thin. Just how thin, though?
Well, Apple has only ever made one iOS device that's thinner than the iPad mini. Not surprisingly, that's the paper-thin iPod touch (5th generation.) The last generation iPod touch matches the 7.2mm thickness of the iPad mini, and nothing else is as thin.
Here's a chart showing the thickness of every iOS device ever made. Besides the thinness of the iPad mini / iPod touch (5), the one thing that really stands out to me is how thick the first three iPhones were. The iPhone 3G / 3GS twins were nearly as thick as the original iPad. Wow.