I like the sound of it because it looks neat but you would blow anything that uses usb as it runs at 5v as already said, unless you could regulate 5v out of it :)
Incidentally if you have an old gamecube, you can pinch the power regulator out of that, put 12v dc in and get 5v out :) its also quite efficient.
(have hacked up a gamecube to do just this)
YOU HACKED UP A CUBE?!!?! WHY!?!?
Because i was going to make a portable, have got part way but got bored with it and discovered mini's :)