UCLA and the California NanoSystems Institute are reporting on rapid progress in Molecular Electronics based on rotaxanes and catenanes [1, 2].
They apparently have an operational 64-bit RAM and are working on a 16-Kbit memory. These have densities that conventional DRAM or disk drive manufacturers can only wish for in their dreams.
1. Flood AH, Stoddart JF, Steuerman DW, Heath JR., Chemistry. Whence molecular electronics? Science 306(5704):2055-6 (17 Dec 2004).
2. Science Daily: Rapid Progress Reported In Emerging Field Of Molecular Electronics (20 Dec 2004).