I bought a meter that shows how much an electrical appliance you are using is costing you:
So far, I have tested it on my Dell Latitude D830 laptop which is hooked to a 17″ monitor through a docking station. The unit calculated that if I left the laptop on for the entire month, it would cost me $4.89 in electrical usage.
I tried it on my Palm 700wx phone charger, which appeared to use the same amount of juice whether my phone was plugged in or not. This worked out to 8 cents a month. I have three of these chargers plugged in around the house, so that brings me up to a cost of almost a quarter a month. Seems worth the convenience to me.
I tried it on my 47″ LCD TV, which is used a few hours a day, primarily by my 4 year old. This works out to $2.50 per month. He’s worth it.
Electricity in Indianapolis, where I live, is $.08 per killowatt-hour.