Atlanta has been weird this year. Early in the year before June, people were going through in about 120 days or so. Then in June it seems that all or most interview activity stopped, until the last week or so of July. This past week, I've seen about 5 people get their IL (I follow this site, VisaJourney.com and Trackitt.com). Application dates have varied from Feb. to May for people who have received IL in the last week.
Check out Trackitt.com and enter your info there. I view the tracker by narrowing the field to the Atlanta DO and sort by application date (that removes from view, other field offices). It will give you an idea of what is happening there.
Hope this helps.
Grashoppr
01/03/2003: GC
06/29/12: N-400 mailed to Dallas via Priority Mail - Atlanta DO
07/03/12: N-400 priority date (Day 4)
07/6/12: Check cashed (Day 7)
07/10/12: NOA recvd (Day 11)
07/13/12: FP notice mailed (Per website - Day 14)
07/16/12: FP notice recvd (Day 17 - Scheduled for 8/8)
07/26/12: FP done - Early walk-in. (Day 27)
07/30/12: Online Status changed to "In Line for Interview Scheduling" (Day 31)
xx/xx/12: IL recvd
xx/xx/12: Interview
xx/xx/12: Oath
xx/xx/12: PP application
xx/xx/12: PP received