The state of Utah tried 10 hours a day, 4 days a week work schedule. This experiment showed that the state had saved USD 1.8 million since May. People are happy with one more off day. According to Scientific American, 40 working hours in 4 days makes good sense for employee health and well-being. This move also helped cut operation cost (electricity?) and transportation expense of commuters.
But, Lifehacker questioned if it could lead to productivity drop. [Lifehacker]