I live on the east side of Atlanta and 131.55, 130.45, 129.125, and 130.025 are fairly active with a mix of Bizjets and Commercial flights.
I just found 136.65 active for Hartsfield with inbound and outbound commercial flights, mostly Delta (wow, what a shock). 136.575 is also another active freq for Delta and some others inbound and outbound Hartsfield.
Rod
Atlanta