Jason Snell, writing on the Six Colors blog:

The trend in laptop design, since the very beginning, has been toward lighter and thinner laptops. In 2001 Steve Jobs boasted about the mind-blowing one-inch thickness of the Titanium PowerBook G4; 19 years later the average Mac laptop is half that thickness.

But it’s one thing to know that laptops trend toward thinness and lightness. It’s another to see a chart that lets you visualize it. So I dug through the specs of past Mac systems at EveryMac.comand averaged the weight and thickness of the Mac laptop product line for every year since the first Mac laptop, the hilariously heavy Mac Portable, hit the scene.

Fascinating graphs. The dive in 2008 in both the graphs is my favorite.