This book covers the latest advances of polymer-inorganic nanocomposites and focuses particularly on high-added-value applications in fields ranging from electronics, optics, magnetism to biotechnology. Traditionally, organic-inorganic composites are considered in terms of mechanical properties reinforcement, the polymer-clay system being the typical example. Recently higher value-added applications have been demonstrated opening new industrial perspectives and markets. This book focuses on electronic, optical, magnetic and bio/medical applications of hybrid nanocomposites where the latest advances are critically reviewed. Various issues in nanocomposite synthesis, including the production scale-up, precedes coverage of the latest advances in the aforementioned range of applications. The reader will get a solid grasp of the state of the art and of the remaining challenges in the field of non-traditional applications of hybrid nanocomposites.