It's true: you can sprinkle them on anything to make it better. Some examples:
- Structures (obviously)
- Reverse Osmosis membranes
- Fuel cells
- Solar panels
- Scaffolds for nerve regeneration
Certain technologies seem to have this magical quality of near-universal applicability to engineering problems. They not only make possible what would have been fantasy otherwise (space elevators, in the case of nanotubes) but also have a knack of improving everything they touch, or of being applied to a breathtaking variety of already-familiar applications.