Concepts, Theory, and Computer Simulations.- Computer Simulations of Thermal Diffusion in Binary Fluid Mixtures.- Thermodiffusion in the Critical Region.- On the Theory of the Soret Effect in Colloids.- Principle of Entropy Maximization for Nonequilibrium Steady States.- A Comprehensive Theory of the Soret Effect in a Multicomponent Mixture.- Thermodiffusion and Nonlinear Heat Equation.- Nonequilibrium Concentration Fluctuations in Binary Liquid Systems Induced by the Soret Effect.- Thermodiffusion in Ionic Solids —Model Experiments and Theory.- Hip, Hip, Soret!.- Experimental Techniques and Special Systems.- Measurement of Transport Coefficients by an Optical Grating Technique.- A Survey of the Thomaes Flow Cell Method for the Soret Coefficient.- Validity Limits of the FJO Thermogravitational Column Theory.- Determination of Thermodiffusion Parameters from Thermal Field-Flow Fractionation Retention Data.- Thermodiffusion of Polymer Solutions in Convectionless Cells.- Convection and Porous Media.- Soret Effect and Free Convection: A Way to Measure Soret Coefficients.- Convective Patterns in Binary Fluid Mixtures with Positive Separation Ratios.- Convective Instability of Magnetized Ferrofluids: Influence of Magnetophoresis and Soret Effect.- On the Soret-Driven Thermosolutal Convection in a Vibrational Field of Arbitrary Frequency.- Thermodiffusion in Porous Media and Its Consequences.- Soret Effect and Mixed Convection in Porous Media.- Soret Effect in Multicomponent Flow Through Porous Media: Local Study and Upscaling Process.