Natural resources are being discovered in more countries, both rich and poor. Many of the new and aspiring resource exporters are low-income countries that are still receiving substantial levels of foreign aid. Resource discoveries open up enormous opportunities, but also expose producing countries to huge trade and fiscal shocks from volatile commodity markets if their exports are highly concentrated. A large literature on the "resource curse" shows that these are damaging unless countries manage to cushion the effects through countercyclical policy. It also shows that the countries least likely to do so successfully are those with weaker institutions, and these are most likely to remain as clients of the aid system. A new World Bank policy research working paper by Anton Dobronogov, Fernando Brant Saldanha, and me considers the question of how donors should respond to their clients' potential windfalls. It discusses several ways in which the focus and nature of foreign aid programs will need to change, including the level of financial assistance.