This one is easy - Wrap your water heater. Americans spend $15 billion a year to heat water, and some simple measures could save about two-thirds of that cost. You can cut the amount of fuel you use to heat the water (and save about $30 a year) by insulating your water heater with a simple jacket (available at most hardware stores for around $20).

One other in their “10” is a clothesline; I discovered years ago, that clothes hung to dry last longer.  Towels and socks are about the only items I place in the dryer.  I have a rolling garment rack in my laundry room and I hang everything else to air dry (no it's not a pretty sight, but effective!)