From the Editor's Summary in the 1 May 2008 issue of Nature:
Basic electronics textbooks list three fundamental passive circuit elements: resistors, capacitors and inductors. But nearly forty years ago, Leon Chua predicted the existence of a fourth, the memristor — in effect a nonlinear resistor with memory. A paper from the Hewlett-Packard research lab now reports that memristance arises naturally in nanoscale systems where solid-state electronic and ionic transport are coupled under an external bias voltage.
See related article at SFGate.com, 5/1/08
HP Labs' find could revolutionize computing by Deborah Gage
Read the full article from Nature, 5/1/08 (Stanford- or by subscription-only)
The missing memristor found by Dmitri B. Strukov, Gregory S. Snider, Duncan R. Stewart & R. Stanley Williams