Yes, lots of things, like the space elevator for a start.
I'm frankly embarrassed that physicists working on these kind of projects are so poorly trained that they don't understand some of the most fundamental concepts of materials engineering (which almost any physics student in this country will tell you is nothing more than physics with all the hard maths taken out).
Fundamental concepts like... the equilibrium concentration of thermal defects, fracture mechanics, sp2/sp3 hybridization and all those other 'little' problems affecting the scaling of the achievable mechanical properties of carbon nanotubes. When it's 2nm long it's all fine and good at 1/3 of the theoretical strength, but when the strongest carbon structure past 2mm is weaker than the majority of low-grade steels and still hellishly difficult to make... well, draw your own conclusions.
Have a quick read of the 'Gigatubes' section of this, if you want a much better scientists' explanation;
I don't dispute that materials on the sub micro-scale have behaviours that are exciting and unusual, but the very nature of the beast means that they don't scale very well. You can have one end or the other. Not both.