Grasping Reality on TypePad, by Brad DeLong

Erik Brynjolfsson and Andrew McAfee: The Second Machine Age:

Now comes the second machine age. Computers and one digital advances are doing for mental power... what the steam engine and its descendants did for muscle power... to blow past previous limitations.... Whether or not the new machine age bends the curve as dramatically as Watt's steam engine, it is a very big deal indeed...