Technological innovation is taking place at a breathtaking pace. We are seeing the emergence of dozens of free or low-cost interactive web applications and services that can enhance the ways we create, share and publish information, and the ways we collaborate and share resources. These developments provide us with a set of technical opportunities and challenges that we need to understand and grasp. To exploit the tools, and tap the full potential of ‘web 2.0’ applications and thinking on institutional and individual behaviours, we also need to consider how these new applications interact with the ways that individuals and institutions communicate, collaborate, and apply knowledge to development problems. This discussion group focuses on Participatory Web for Development.