Have you ever wanted to actually monitor how much energy your phone charger, computer, etc. actually uses in your household? The Seattle Library is checking out these handy devices that measure your energy usage - just plug it into an electrical outlet and see how much energy you use. I'm not sure how this would work for apartment dwellers whose energy is shared with the rest of the tenants - I'm guessing it would monitor the entire building.
Knowing me, I would turn this into a competition with the device and run around the house turning off or unplugging all sorts of things so I could get the number to go down. Sigh... I am who I am.