Install Compact Fluorescent Bulbs
 Replace your regular light bulbs with compact fluorescent bulbs. They use just a fourth of the energy. Most take up a little more space than regular bulbs, but they will still fit in lots of light fixtures.
Flourescent bulbs used to be criticized for the flickering, bluish light they gave off (making people look like they belong in "Night of the Living Dead"). But now we can get flourescent bulbs that almost match incandescent bulbs for warm light and color.
For really small fixtures, you will want sub-compact flourescent lamps, which can be hard to find.
Now you can even get compact flourescent bulbs that will work in 3-way fixtures.
Word of caution: never put a compact flourescent bulb in a circuit with a dimmer unless the bulb is specifically designed to be dimmable.
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