I have always thought tail-sitting aircraft are cool, especially the Convair XFY-1 "Pogo". I just ran across some info on the Skytote UAV:
AeroVironment INC of Monrovia, California, manufacturer of solar-powered endurance UAVs described in a later chapter, is also developing a pogo UAV named the "SkyTote" under an Air Force contract. It is described as a demonstrator for a vehicle intended for the precision delivery and pickup of "cargoes", a description that covers an extremely wide range of actual applications. Details are unclear, but illustrations of the SkyTote show it to be another pogo-type tailsitter, with a surprising resemblance to the pogo fighters of the 1950s. It is powered by a Wankel rotary engine.