Plan Ahead
Periodically discuss energy savings ideas and list them with your family and/or roommates.
Revert to that list while during your next meeting to evaluate your actual savings and how to improve.
Have fun with it.  Reward those who do the most around the house to try and save on energy costs.
Analyze your utility bills.  Do not just open the bill, sign the check and mail it.

Fireplaces
Everyone knows a fireplace is one of the worst energy suckers.  Glass door installation can help alleviate some of the heat loss.
Burn only dry wood and have your chimney cleaned approximately once every 2 years.  Look here for the best woods to burn.
Shut the damper or flu while not in use.
Do not leave the fire burning when you go to sleep because your flu or dample will remain open all night.  Put your last log on an hour or two before you go to bed and shut flu or damper when the fire is near completion.
Keep the damper open periodically in the summer to create a natural cooling draught.
Seal the chimney with fiberglass insulation if you do not use your fireplace.  You can also use silicone caulk to seal the doors.

General
Be smart, unplug appliances that will not be in use for a period of time (i.e. tv, vcr, microwave, game console, etc.).
Turn off the dehumidifier and humidifier if they are not needed during hot or cold periods.
Do not leave the water running while brushing your teeth.
Purchase items online when possible as this will save on gas.
Cancel subscriptions and opt to read articles online.

Heating and Cooling
Don’t underestimate the heat a space heater can put off and save money on your energy bill if you have gas or oil heat.
Make sure all vents and units are swept regularly to avoid accumulation of dust.  Units will work harder if they have less air to circulate.
Adjust the thermostat in small degree increments.
Consider installing a programmable thermostat. 
Setting a schedule on non-peak hours (at sleep or at work) will help save you money and wear and tear.
Keep filters clean and change them regularly.  About once every 2 months is recommended.
Keep freon in the air conditioning current.
If installing a new furnace, check the energy rating as this could save you on tax savings.
Consider putting your air conditioning unit in shade as it will operate more properly.
Bleed water every 2 years from a boiler unit.
Reverse a ceiling fan’s rotation in the winter to push the hot air from the ceiling back down to the room.
Close doors you do not use frequently.
Wear additional clothing.

Insulation and Caulk
Use weather strips where needed on windows and doors.
Adding additional insulation to the ceilings, walls and floors will keep heat inside during the winter and keeps heat outside during the summer.
Use insulating socket covers underneath the plate.
Make sure to seal any cracks in your basement and make sure the window wells are air tight. 

Kitchen
Cutting foods and vegetables in small pieces will take less time to cook.
Look through the oven window to check your food.  You lose a considerable amount of heat when you open the door.
Let hot foods cool off before putting them in the refrigerator.  The refrigerator will work harder to cool hot foods.
Check your refrigerator seal to ensure it is plush.
A refrigerator should be between 35 and 38 degrees F.
The freezer should be between 0 and 5 degrees F.
Use only a full load when running the dishwasher.

Laundry
Use your timer on the dryer.  Do not over dry.
Empty the lint filter after or before every use
Use cold water.
Try to wash and dry full loads.
Do not over fill the dryer.  It will not dry as well jam packed with clothes.

Lights
Turn off lights if you do not need them on.
Heat radiates from electric lights.  So turn off in the summer if you can.
Replace incandescent light bulbs in your home with energy saving compact fluorescent lamps.
Use dimmer switches where possible.  Sometimes the lighting in a room can be just as nice dimmed, and will save on energy.
Use a low wattage bulb for outside illumination.

Water Heat
Insulate your hot water tank which will reduce heat loss and save energy.
Take advantage of the “vacation” mode if you are away from home more than 2 days.
A leaky faucet will leak your money, fix it.
Take a shower and not a bath.
Use a low flow shower head or take shorter showers.
Use cold water for washing hands, brushing teeth, and laundry.

Windows
Replace single pane with double pain windows.
Storm windows can reduce heat loss by 25 to 50 percent.
Use the sun’s solar heat and keep the south side of your home free of trees and shrubs.
In winter, during the day, open all drapes and close them at night.
In the summer during the hot parts of the day, close the drapes.