Treehugger: How Windows XP Wasted $25 Billion of Energy
"Microsoft has been touting Vista's new power saving features, saying that upgrading to Vista could easily save consumers and corporations $50 to $75 per computer per year in energy costs. The question, though, is what marvelous new code makes this miracle possible. The answer? They fixed three stupid mistakes that have cost the world billions of dollars and millions of tons of CO2 in the past five years."