1. A nanotube switch, comprising: a nanotube ribbon comprising a plurality of nanotubes and having upper and lower major surfaces; a first conductive element in contact with at least a portion of the lower major surface of the nanotube ribbon; and a second conductive element in contact with at least a portion of the upper major surface of the nanotube ribbon, the nanotube ribbon capable of switching between first and second states in response to electrical stimulus at the first and second conductive elements.