Robberymaps is a Spanish language crowd-sourced Google Map showing the locations of robberies around the world.
The site was launched in Barcelona and most of the user submitted reports of robberies are still submitted from the city. At the moment then the map is most useful for people who live in Barcelona or are planning to visit. The map is full of useful user submitted information about areas of the city that you should be particularly careful.
Barcelona is fairly well known for its gangs of pickpockets. This map could therefore be very useful if you want to find out the latest areas that the gangs have been seen operating in.