Maison Robert is an Atlanta institution. They've been around for years and everyone I know seems to have had their chocolate over the course of their Atlanta lives. Last year, the establishment moved to a bright, new location across the street from the Chamblee MARTA station (on the back side). It's a family affair; they added baked goods as part of their move along with tables that are ideal for a morning croissant-and-coffee stop.
Monsieur Robert is a traditional European chocolatier. I am a hazelnut freak, so I always try those, but he makes a number of wonderful items both small and large. The baked goods include both sweet pastries, such as pain de chocolate, and loaves of bread from which they also make sandwiches.