USB Port: Powered or Just Data?

Does the USB port on the MacBook Air provide 5VDC power? I ask this because long ago, in a distant galaxy, I had a Dell laptop. It did NOT provide power to the USB port - only signal. Thus, any peripheral expecting to be run from the 5V power of the USB port didn't work unless a powered hub was connected to it first. I'm looking at purchasing a piece of equipment that the manufacturer states "no external power supply needed; power is provided by the USB port".
Anyone know for sure on this?

That USB port provides power. Click here for more information.
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