Secondly, define the types of crimes you are measuring - property crimes and violent crimes are different, beat for beat, and quite often retail centers and bar/restaurant districts can skew the numbers of the quiet, tree lined street neighborhoods nearby.
Third - What exactly are you attempting to gauge with your question? Is this about real estate value, or some other matter?
Fourth - check the web reference for Trulia's excellent Crime beta site.
Fifth - when you really break it down, the facts are zone by zone, and the most telling data is in the beat books at each zone office. APD manages 6 zones and a Major commands each zone. Connecting with the zone for facts and information is as easy as walking in and asking questions or as easy as attending events like neighborhood association meetings where officers discuss crime with neighbors on a regular basis. http://www.atlantapd.org/findmyzone.aspx