How much electricity are your devices using? You may have some idea, but you can't be sure unless you measure. The Kill A Watt meter is simple. You plug it into an outlet, plug something into it and it tells you how much power is being used. For items like refrigerators and computers that go on and off, keep it plugged in for 24 hours and it will tell you how many kilowatt hours per day are being used.
Everyone should know how much electricity their devices are using. This device really get you in touch with your electricity usage. It allows you to figure out what are the big ticket items in your house. I recommend making a spreadsheet of before and after readings to track your progress. Install CFL's, add software to PCs, set the timers on coffee makers and other appliances.