Here is the first comprehensive overview of the fabrication, fundamental properties, and applications of a new class of nanoscaled organic materials that holds huge promise for optical and electrical applications. By using controlled self-assembled growth on single crystal surfaces, fiber-like structures are fabricated with macroscopic lengths up to millimeter size, mesoscopic widths of mere hundreds of nanometers, and nanoscopic heights of tens of nanometers. The extraordinary beauty of these new structures is that they are quasi single crystalline, providing superior optical and electronic properties that can be freely tailored via functionalization of their organic building blocks. Altogether, the book offers a unique integration of organic materials science basics, nanostructured organic materials fabrication, and device applications.