Apropos of nothing, except UNIX noodling, the commands df and du have a --human-readable (-h) option on most modern unices.
I can't tell you how much joy this discovery brought me. In the days of sloshing around 2.1 gigabytes just for the heck of it, trying to calculate in my head how much space a directory took up, or how much is left on a drive, was getting difficult.
Yet another of life's little victories.