4. CFLs.
Replacing incandescent light bulbs with compact fluorescents (CFLs) instantly and drastically reduces energy consumption.
5. Computer.
Your computer uses a lot of energy just to stay on and running. Turning off the computer when you aren't using it, or even using Energy Saver settings to shut off the monitor and power down the hard drive, is an easy going green step that has a big impact.
6. The thermostat.
You know this one. It's still true: turning down the thermostat in winter and up in summer, even by 1 or 2 degrees, will save not only a lot of energy, but money too.
7. Laundry.
Wash full loads, and wash in cold water. Today's laundry detergents work just as well in cold water as hot. Using cold water saves the energy that would have gone to heat the water.
8. Transportation.
Carpool, even if it's only occasionally. If carpooling to work is impractical, coordinate errands and shopping trips with friends and plan to go together. Take public transit when feasible. Bike or walk rather than drive in nice weather. Even sharing 1 car trip a week or replacing 1 car trip with public transit or a bike ride has a big positive impact.