Ah geez I'm doing some research on this... interesting that on the raspberry pi forums, feeding power into the GPIO pins (like how our mboards are doing) is not recommended because it doesn't have any power protection.
This is true, sort of. But if your m-board has power issues then your likley to fry you h-boards. Right now your worried about the $40 component when the smoke is coiming out of the $500 component.
/cet.