"Researchers led by Alex Zetttl at the University of California, Berkeley have crafted a fully working radio from a single carbon nanotube 10,000 times thinner than a human hair...Its inventors have already used it to broadcast two songs: "Layla" by Derek and the Dominos and "Good Vibrations" by the Beach Boys. "
http://news.yahoo.com/s/livescience/20071102/sc_livescience/microscopicradiosetsminiaturizationrecord;_ylt=Ag44r5C7BJ18ffSxXplmRMMDW7oF