In case you don't read Slashdot:
FnH writes "Derek Lovley and his colleagues of the University of Massachusetts discovered that the Geobacter bacteria is capable of producing nanowires. The bacteria is normally used to clean up toxic waste. Geobacter does not use oxygen, but metal as its source for power. This probably explains the 3nm to 5nm nanowires it excretes while working. What metal the nanowires are made of is not yet known, but the genetic code responsible for their creation is. This opens up the possibility of modifying the bacteria to create nanowires on chips."