In the last few years the interest in Unmanned Aerial Vehicles (UAVs) and their use for an ever increasing range of applications has grown tremendously. This [[wysiwyg_imageupload::]]type of aircrafts can be controlled remotely or programmed to fly in an autonomous way. They have been used for different types of applications as individual entities, both in military and civil tasks. Research related to this type of systems is being undertaken in many areas going from the design of more efficient aircraft aimed at specific applications, to the development of improved control electronics that provide for better autonomous behaviors, to optimized path planning strategies, or to opening new application domains. Currently, a whole new field of research is opening up in the area of coordinating UAV teams to cooperatively perform different missions. This field is still in its infancy and many exciting new approaches are being explored for different applications. Examples of these are works related to trajectory planning in UAV teams, real time target tracking, and many others.