From http://www.theregister.co.uk/2009/08/12/spy_quadrotor/

At the Defcon hacking conference in Las Vegas in August 2009, Antoine Gademer and Corentin Chéron of l'Ecole Supérieure d'Informatique Electronique Automatique demonstrated a slimmed-down version of their low-cost spying quadrotor. To the amusement of many, the 27-inch UAV flew high above a parking lot adjacent to the Riviera Hotel as it used its bird's eye view to shoot video of unwary passersby below. (less info)