Memristors are very interesting Here you can learn allot about them(nextbigfuture.com)

http://nextbigfuture.com/2010/06/hp-predicts-stacked-memristors-low.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+blogspot%2Fadvancednano+%28nextbigfuture%29