This volume assembles contemporary evidence of domain formation in membranes gathered by leading researchers in fields ranging from membrane biophysics to cell biology. Questions relating to how non-random membrane arrangements are defined, detected and monitored to characterise their dynamic behaviour are addressed. The components associated with membrane rafts are examined and the different mechanisms employed to create membrane microdomains are considered. Evidence relating to the regulation of membrane microdomain formation in the context of membrane biogenesis and homeostasis is discussed. The role of membrane domain formation in the generation and transmission of signals transduced via membranes to evoke a variety of physiological responses is examined and examples of where membrane domain structures are involved in infection and disease states are provided.