The NY Times has gotten into the whole Google Maps mashup craze with this map identifying every murder committed between 2003 and 2005.
Between 2003 and 2005, 1,662 murders were committed in New York. Men and boys were responsible for 93 percent of the murders; their victims tended to be other men and boys; and in more than half the cases, the killer and victim knew each other.
More information in the related article.
