http://www-128.ibm.com/developerworks/power/library/pa-spec7.html?ca=dgr...
includes:

"In some cases, a device will use only part of the USB spec. Nintendo Gameboy SP is rechargeable -- and a third party sells a USB charging cable for it. This uses the physical spec and power, but doesn't even show up as a device. The protocol is ignored entirely. This is common enough that some car and airplane AC adapters now offer a "dumb" USB port which just provides power for rechargeable devices. "

I'm fed up with carting transformer bricks around and have been thinking for a couple of years about ways out of the mess. There are only two widespread low voltage DC "standards": car cigarette lighters and USB.

Any ideas how to promote and publicise USB as a power standard?