Two novel electronics based on molecular conductors are discussed. One is a crystalline supramolecular nanowire comprising conducting cation-radical molecules and halogen-bonded insulating networks. The way to utilize this nanowire for nano-size wiring in high-density memory is proposed. The other is a field effect transistor with highly correlated electrons on the conducting molecules. The Mott insulating state of organic interface is transformed into a metallic-like state by electrostatic doping, or band-filling control due to the capacitive effect of the transistor configuration. The Mott-transition transistor can be a new type of transistor driven by a phase transition.