I haven't really been a John Mayer fan, but his new CD Born And Raised is fantastic. Mostly acoustic and he really get's some great acoustic sounds and experiments with a few effects.
I thought I'd just experiment with some different sounds.
EJ-200, into a MXR Carbon Copy into a Behringer ADI21 DI to two electric amps.
I usually have the mics right, but when I ran two amps, it kinda distorted the sound; but sounded fine in the room.