There should be a list of all Plantations by at least historical counties/ and Family Research related to them. I think tracing our ancestors back to the individual plantations where possible, listing which names (usually would be first names, with the owner's name assumed as last?), and correlating Freedman's Bureau and the transhipment records and slaves purchase/sale/manumission and estate records where possible, would be a valuable project, in that as it reached a critical mass it would make many advances in African American research on these issues easier. A lot of this is online but not aggregate or associated in a useful way. I have also seen at least one such website based on three southern states (I think it had Piedmont in the title), but is there a place that this is aggregated, does anyone know?