It's true: you can sprinkle them on anything to make it better. Some examples:

• Structures (obviously)
• Reverse Osmosis membranes
• Semiconductors
• 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.