The lively interest in organic solids stems from our increasing ability to manipulate and tune the properties of organic and organometallic materials (e.g. nonlinear behavior or electrical conductivity) by systematic variations of the molecular components. New insight derived from modern supramolecular chemistry are also allowing molecular level control of solid-state structure with the arrangement of functional molecular components into a defined solid architecture. Examples include the creation of nanoporous host lattices containing functional guest molecules and of defined nanomaterials. In this book, leading experts in the field give a state-of the art overview of our current knowledge and of future prospects, with chapters on directional aspects of intermolecular interactions, supramolecular synthon approaches, hydrogen-bonded tape, ribbon and sheet motifs, designed organic zeolite analogues, and crystalline polymorphism.