There are many worthwhile uses of nano....
Nanotechnology Creates Super-Strong Fibers for Bullet-Proof Vests: "Hong Kong University of Science and Technology: Researchers at the Hong Kong University of Science and Technology (HKUST) have developed a new technology that can greatly enhance the ballistic-proof strength of ultra high molecular weight polyethylene (UHMWPE) fiber by adding carbon nanotubes."
(Via Nanoforum.org News.)