building tiny cpus could be done by microrobotics i bet.

Quoted from the New Scientist source:
"By contrast, the graphene transistors were made in the same way that silicon devices are, by etching them out of larger pieces of material. "That's their big advantage," he says."

I suppose those quantum dots can be made by etching small dots from graphene.
Graphene isn't exactly hard to hake either

Nice, but they'll still run like *%@"! on Windows Vista.