Insulated Waterbeds
You can reduce the amount of energy used by your waterbed to the lowest possible level by insulating it.  Polystyrene foam can be used to insulate the bottom and sides of your waterbed.  You can insulate the top of your waterbed by making your bed each morning.  Lowering your thermostat as much as possible will also give you energy savings.

Shut Off the Computer
When shutting off your computer at the end of the day do you also remember to turn off all the accessories such as the monitor, printer, and speakers?  You can save lots of energy by making sure that all your computer hardware is turned off at the end of every day.

Energy Audits
You can conduct a home energy audit to determine exactly how much energy your home is using.  The Home Energy Saver site (hes.lbl.gov/hes/vh.shtml) can give you all the information you need to conduct your audit.  By simply entering your zip code and basic home information you will be given lots of helpful energy saving tips for your specific location.