I obviously have a fascination with military hardware. Couple that with my love of RC aircraft...Raytheon now has a small air to surface guided munition that smaller UAV's can carry. They call it the STM (Small Tactical Munition). You can download a little video from Raytheon that shows it in action.
It appears the guidance system was the focus of the video, as there is no BOOM! Also, not explicitly stated is it appears to be effectively a guided bomb, i.e. no propulsion system (other than gravity).