Rami Tabello, in Toronto, is obsessed with illegal signs (nice google map mashup) in Toronto. He is photographing them, publishing them, and putting pressure on the sign owners and city hall to address the visual pollution. Vigilante, maybe, but cities and businesses can definitely tap into people's obsessions to increase their productivity, given limited resources. We should even pay them a stipend, at least to learn how they collect and manage the information they collect. We do it for potholes, why not expand to other things that the masses can help us with?