On 6/3, my flight from IAD-ORD had smooth boarding, although the process was untraditional. It was only a dual lane gate and had the potential of being a disaster with our full flight. However, a captain waiting for his incoming aircraft at the adjacent gate assisted the GA. He escorted the only GS to the door, lined folks up, walked up the lane to announce the current boarding group to those in line, and sent group jumpers to the back. It was quick (I was one of last in group 2 and got on in 3 minutes), painless, and actually quite fun as the captain had a good sense of humor. Too bad it's not the norm.