I drive a hybrid and I try to use sunlight as my light source during the day. But it turns out my office printer sucks as much energy in stand-by as when it is printing. By turning it off when I don't need it, I'm saving electricity.
Day Two - using less energy produced by fossil fuels
Day One of 20 Ways, 20 Days, 20% less carbon
Take the Union of Concerned Scientist's 20/20/20 Challenge