I have not been active on this board before but that may change. ;)
I have one daughter who is 6 1/2 and doing mostly 3rd grade work, I suppose--if I was into grade levels. She began reading at 3yo and taking piano lessons a couple of weeks after she turned 4yo. She is quite at ease in performing--in fact, performing for people is when she really shines.
She is people oriented in her studies also; she would recognize the presidents on coins before she knew the names of the coins. She also loves geography and forces of nature--well, just about anything with science really.
I don't know if she is actually an accelerated learner or just has an amazing memory and desire to connect things with people and animals. It seems the subjects that rely more on memorization and communication are the ones where she excels, so she is easily learning French, Latin, Greek and Sign Language simultaneously. Math, being more conceptual, was a bit more challenging for her last year, but now she is doing very well in it also.