A quick google search of "green + computing + screensaver" turns up this link from the University of Ohio's Ecology and Energy Conservation Committee: Energy Saving Tips for PC's
I was looking for some data to support the idea that powersave/sleep mode is more energy-efficient than screen savers. UofO's Green Guide is more comprehensive, debunking some commonly held myths regarding PCs and power use.
For example:
Myth: Turning off your computer uses more energy than leaving it on.
Truth: The surge of power used by a CPU to boot up is far less than the energy used by the unit when left on for over 3 minutes.
They provide instructions on how to reset your screensaver to a mostly black background for a number of Windows platforms, or how to set powersave mode.
So, to answer my question, according to the Energy Star website, "Spending a large portion of time in Sleep and Off Modes not only saves energy, but also helps computer monitor equipment run cooler and last longer."
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