Roland Piquepaille writes "Scientists at The Scripps Research Institute (TSRI) have constructed a single strand of DNA that spontaneously folds into a highly rigid, nanoscale octahedron. These clonable structures represent a breakthrough because they can be manipulated with the standard tools of molecular biology and can easily be cloned, replicated, amplified, evolved, and adapted for various applications. This opens the way to future nanotools and to the minuscule computers of tomorrow, even if we are quite far from any real products. This overview contains more details. You'll also see a great picture of a clonable DNA octahedron, roughly the size of a small virus."