Rob Cockerham went around his neighborhood and estimated how much his neighbors were paying in electricity charges for their Christmas lights. For the house above: 2,135 watts = 26¢ per hour.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.