I can't help but notice that all these places are in big cities. I was always taught that the best barbecue was sought on the road.
Try this one, for example, if you're ever up in northwest Georgia. If you're traveling north from Atlanta, swing off I-75 on I-575, then take GA 372 until you see the sign for the little town of Ballground. There's a little back road off 372 that will take you to Two Brother's Barbecue, home of great ribs and tangy sauce, and good ice cream too.
Any good ones that you folks have found on the back roads?
UPDATE: Another one you might try is Backwoods Barbecue, up Long Branch road near Dahlonega. If you're coming from Atlanta, take Georgia 400 to the end and keep going straight when the superhighway ceases, and the two-lane blacktop begins. It's only open on the weekend, though.