I was at Walmart on the weekend, and it was quiet in some of the frozen food isles.  Something seemed funny as I started going down one of them.  All the fridge units were dark – like there was a power outage.  As the cart rolled past the first one, the light inside came on.  Above each unit, there is a little motion sensor that detects that there is a customer.  What a great way to save power, and to save some money on the power bill.  Very impressive.  It is small, but it does show that mega corporations are looking to the future – both for energy use, for their shareholders and most importantly, having lower prices for their customers.