The EPSRC Ideas Factory has opened up a public blog to accept ideas for software control of matter
Chris Phoenix has contributed Silica-nucleating proteins (e.g. silicatein) might be used to make silica structures. Chris points out mechanosynthesis of [molecularly precise] structures is much broader than diamondoid or Drexler, and blends into approaches that don’t even require covalent chemistry.
Robert freitas contributed his ideas on diamond mechanosynthesis