Use fewer bulbs in multibulb fixtures. Most users don't realize that one strong bulb is more efficient than several weaker ones. And it uses less energy than two 60-watt bulbs, but yields approximately the same light. For safety's sake, insert a burned-out bulb in any empty sockets. The light timer plugs into the wall and the lamp plugs into the timer.
Light timers are available at most hardware stores.
You can install dimmer switches wherever you only need bright light occasionally. Though written before many of the latest improvements in lighting efficiency, this book offers great tips on choosing and using efficient lights.