Use task lighting equipped with energy efficient compact fluorescent light bulbs rather than lighting the whole room.
Here are some helpful industry links to help you save on your energy costs.
http://www.energystar.gov
http://www.lamprecycle.org
http://www6.homedepot.com/
http://www.earth911.org
http://www.epa.gov
http://www.tcpi.com/recycle.aspx