The authors explore the use of Web 2.0 tools for development and introduce readers to the concept of Web2forDev. Web 2.0 tools are radically changing the ways we create, share, collaborate and publish digital information through the Internet. Participatory Web 2.0 for development (Web2forDev for short) is a way of employing web services to intentionally improve information-sharing and on-line collaboration for development. It presents us with new opportunities for change - as well as challenges - that we need to better understand and grasp. The authors consider learning and reflections from practice and consider ways forward.