Ok, well, you might have heard of them, but I have not heard of Crimedar, Mapacrime and Sgo (SureteGlobale.Org). CloudTweak cites them as the crime mapping startups to watch in 2012.
CrimeDar is built on Bing and Silverlight and includes a crowdsourcing component, but has limited coverage (mostly in Michigan) with offical police and their data.
SGO appears to be a services company moving on to products. Per CloudTweak, a KML analysis file to be used on the platform of your choice. The solution is for law enforcement rather than the public, and will include crime analytics and hotspot analysis. The company is based in France.
Mapacrime is an offshoot of HarassMap (which is itself build on CrowdMap, which is built on Ushahidi) and uses crowdsourced information to track crimes in Pakistan.
It's hard to imagine any of these unseating CrimeMapping.com, CrimeReports and other efforts gathering momentum at least here in the U.S.