This Remote Flash Power Control Hack is Genius
Some ideas are as brilliant as they are obvious—in retrospect.
With some minimal soldering skills, Strobist reader Ilya Terentyev (originally from Moscow but currently in Beijing) is using a cheap, auxiliary remote to control the power levels of a manual flash remotely.
It should be noted that the hack is only possible on flashes with a simple, mechanical switch for increasing and/or decreasing the power level. The discussion thread is here.
(Thanks to BudroWilson for the tip.)