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Oak Ridge National Laboratory, which conducts all of its research in tuneful four part harmony, has developed a system that uses sunlight (I actually started to write 'solar-powered light') pumped down fiber-optic tubes to complement an integrated system of flourscent bulbs. When there's sufficient light outside, a sensor cuts the electric blubs, letting the light shine in. Obviously, piping light from roofs to fixtures is something that's best done when the buildings are actually built, but it's a great idea all the same.

Of course, they don't mention that the light snakes down around your throat as you sit in satori, attempting to harness the power of mind to expand your forehead real estate. (Thanks, Boo Boo Prime!)

Sunlight in a tube [World-Science]