Replace all of your incandescent light bulbs with the florescent replacements. They take a little getting used to but they save some heavy cash on the electric bill.
Turn off your computers if you are going to be away from them for more than an hour or two.
Turn your furnace down a couple of degrees. Instead of 72' I run mine at 70'. In the summer, run your AC at 74' vs 72'.
Combine trips if possible. I never go out of the house to do just one thing if I can help it. I try to save up and kill 2 or 3 things with one trip.
Buy all the stuff you use when it is on sale. Not always possible but when it is, stock up if you can.
This one was very hard for me to implement. Turn off the lights when you leave the room if they are incandescent or screw in incandescent replacement florescents. Ballast started florescent lights are cheaper to run for and hour that they are to start up.
Do not stand with the refrigerator door open (this one is still hard for me). Know what you want and get it out. Shut the door.
Turn down the water heater. You are going to mix cold water with the hot when you shower anyway. Why heat water just to cool it back down? This is also handy for keeping the kids from taking half hour showers. They are out of hot water way before that.
Open the drapes in the winter and let the sun in, close them in the summer to keep the sun out. Close them at night in the winter. They are a source of insulation.
Ceiling fans. I can't say enough about them. In the winter I use mine pulling up, in the summer I use them blowing down for the cooling effect.
Yell at the kids for opening the door and holding it open to talk to their friends. "In or out".
I have had to learn to cut corners. We had a 70% hike in electricity this summer. My bill is lower than it was before the hike.
I have more and most of what I posted is just saving on home energy and gasoline with a few bucks at the grocers. I will post back when I think of more of my cheapskate tricks.