A brighter idea.

Most people realize that the screw in fluorescent bulbs (CFL - compact fluorescent) can give you the same light as the old incandescents, but use less energy.  A 13 watt CFL bulb gives you the light of the standard 60 watt incandescent bulb. 
But did you know that you can get an added bonus?
If a fixture says 'Maximum 60 watts' (due to the heat build-up of the bulb), you can use a brighter CFL bulb that still generates less heat.  For example, a 23 watt CFL bulb gives you the light of a 100 watt incandescent, but still only the heat and energy usage of a 23 watt bulb.  More light, less electricity - not bad.