Beorytis writes: "MIT Technology review reports on a recent paper by Stanford professor Dr. Jon Koomey that claims to show that the energy efficiency of computing doubles every 1.5 years. Note that efficiency is considered in terms of a fixed computing load, a point soon to be lost on the mainstream press.
Also interesting is a graph in this related blog post that really highlights the meaning of the "fixed computing load" assumption by plotting computations per kWh vs. time. An early hobbyist computer, the Altair 8800 sits right near the Cray-1 supercomputer of the same era.
Warning: you'll have to get past the usual misstatement of Moore's Law (saying it relates to processing power rather than transistor density)."