Wireless and mobile computing have advanced significantly in the last decade. In particular, we now face the challenge to spontaneously establish wireless self-organizing networks, such as ad hoc, disruption-tolerant, sensor, and wireless mesh networks. These spontaneous self-organizing networks have been the focus of intensive research activity in recent years. Spontaneous networks arise from the cooperation of mobile devices in an ad hoc fashion requiring no previous infrastructure in place. A key point to couple research and real-life applications in this context is to understand how mobility (of devices, users, and applications) impacts practical networking aspects.