Recent studies indicate that sunlit snow and ice surfaces are highly photochemically reactive. Emissions of a variety of species have been measured from high and mid-latitude snow and ice, including NOx, molecular halogens, alkyl halides, formaldehyde, acetaldehyde, acetone, and others. Modeling studies indicate that these emissions could significantly impact the overlying atmosphere, affecting processes such as tropospheric ozone depletion and the oxidizing capacity of the atmosphere. Laboratory studies have shed light on many of these processes at the molecular and mechanistic level, but we are still far from understanding the diverse chemistry that can occur on frozen surfaces, mainly because we have yet to fully characterize these reactive surfaces under varied environmentally relevant conditions. An examination of the available research will be presented, as we look forward to further advances in the field of ice/snow photochemistry.