Many innovative folks, some who have too much spare time, have found their calling applying the technology behind Google Maps to their own area of interest. One useful application is plotting crime reports on a map. Perhaps the most well-known one is ChicagoCrime.org. Berkeley, California crime incidents are now also mapped, covering the past year. The data can manipulated by date, incident type, zip code and time of day. The results are displayed on a map and the incidents, with report numbers and street address, are listed.
PhillyCrime.org covers crimes reported by the Penn University PD and crimes located in the 18th District of West Philadelphia.