I am hearing more and more about graphene. Looks like a breakthrough nanotechnology material.
My understanding about the supercapacitors, or any capacitors is that the amount of energy they can store depends on the amount of surface area. I compare them to lungs in that sense. If they can cram enough surface area into a capacitor, it could revolutionize portable electric power.
Imagine an electric car with a 1000 mile range between charges and it only takes five minutes to charge. Careful not to touch any wires though.
...and blacks out your whole neighborhood during that five minutes...