The Economist features a good article about new UAVs. They are going to be deployable in the next 5-10 years.

I remember an embedded reporter on CNN in the last days of the Iraq war stating, "...the sky of Baghdad is black of helicopters and drones" - a good metaphor for the new kind of warfare.

However the aim of these new UAVs is mainly reconnaissance missions. But besides military use there is an interesting idea to use it as a mobile basis station for crowded outdoor events.