From a Champaign police press release today:
The Champaign Police Department announces a new partnership with CrimeReports. (Creators of the National Crime Map, at www.CrimeReports.com.) Citizens will now have the ability to view reported Champaign crimes via the web and/or iPhone app. In addition, citizens can sign up to receive a crime alert when a crime is reported in an area they are interested in or if a registered sex offender moves into their neighborhood.
For the record, that mobile app is not available for Android phones. I checked on my Android phone.
And the service isn't free; it's costing the city $199 per month, which is covered for 12 months by a state grant.
Read this August story for more details.