Nanoelectromechanical systems (NEMS) in which a nanomechanical resonator is coupled to a mesoscopic conductor, such as a single-electron transistor, form a new class of mesoscopic quantum systems in which there is a fascinating interplay between the electrical and mechanical degree of freedom. Coupling to nanomechanical degrees of freedom can modify the transport properties of mesoscopic conductors substantially, giving rise to a number of novel phenomena such as electron shuttling effects. Sensors continue to make significant impact in everyday life. With the advent of nanotechnology,...