even the keyboard has two right...
If you have one of the new slim keyboards, they are powered.
If they are, it's not much. If my plug my iPod and headphones into them at the same time, OSX gives me an error informing me that I am attempting to pull too much power through my USB ports. If I hook up the same devices through a normal hub, everything's fine.
Does anyone know if the wireless keyboard has a usb port also?