The most common needs following a crisis are well-represented in the UN Cluster system: health, food, water and hygiene, and emergency shelter, among others. Our first inclination is to consider connective technology like the web a fairly limited tool for changing such concrete, on-the-ground realities. And it is, relative to the resources and supply chain logistics of formal aid groups. But there have been a few worthwhile examples, in recent years, of participatory aid projects that take on these basic challenges in new ways thanks to mass goodwill organized with information technology.