Buying Energy Star-rated appliances and making sure your home is well-insulated and energy efficient are the best ways to save money on day-to-day electrical costs.
By turning off your computer or unplugging the TV or coffeemaker when you're away from them, you'll save a good bit of energy over the course of the year. The computer workstation you're using right now might be connected by a power strip. If so, turn that baby off when you're done for the night, and unplug anything else you're not using. Keeping your computer's energy settings on "power saver" is another way to keep from wasting energy.
Remember, wasting is the opposite of saving. While there may not be a single big change or trick that will drastically reduce your energy costs, being mindful of the way energy is used in your home will help you save a significant amount of money over time.