Here is some info on how hobbiest and businesses with some technical skill, some budget and the desire could make their own UAVs. There are currently few regulations for radio controlled planes and flyers that have a total weight less than 2 pounds. If this did not change then the improvements in MEMS and other technology would make for quite capable devices under that weight limit. Radio controlled planes flying up to 2000 feet are relatively standard and are currently easily outfitted with cameras.
PiccoloPlus Autopilot $6000
Piccolo II Autopilot – fixed wing version $7500
Piccolo Ground Station $7500
Gumstix makes gumstick size 400MHz computers with 64 MB of memory that can be added to planes for various control purposes.