Richard Akerman of Science Library Pad draws attention to a crime map (of Ottawa as it happens). If you happen to live in that fair city, you can use the map to see which streets are most popular with criminals. They don't really need to have such a map for Kingston upon Thames as there are only two sites for crime (two "nightclubs", O------ and The W-----), as well as the river itself of course which is convenient for dumping the bodies. (Three people who met premature ends have been found there in the 18 years I've lived here, according to the local paper.)
I wonder if someone could make, or has made, such a map for fictional crime?
However, as Richard points out about Ottawa's latest: "If this doesn't seem too novel, keep in mind that chicagocrime.org was one of the original crime map mashups, and it was only created in May 2005 (see In memory of chicagocrime.org )".