The IceCube Neutrino Observatory is a 1 km3 optical Cherenkov detector embedded deep in the ice sheet that covers the geographic South Pole. Since its completion in the austral summer of 2010, data from the observatory have provided the first evidence for a flux of extraterrestrial high-energy neutrinos of multiple flavors. At the same time, the lack of significant clustering of neutrinos in space or time has provided constraints on the kinds of steady and transient sources that contribute to the flux. I will review current IceCube results, provide an overview of ongoing efforts to sharpen them, and briefly discuss plans for future detectors at the South Pole.