I'm a social worker and like you, I'm relocating to ATL on 2008 and have begun the research for my elderly parents. I would suggest that you go directly to the Medicaire.gov website and then locate the resources for Georgia. In addition, the United Way has a resource guide on services for the aging: (
2-1-1 Call Center Search). I highly recommend that you review that website anytime you need to locate social services. You should try to locate an organization that helps coordinate the transition of benefits from one state to the other.
Best wishes on your relocation!