This special issue contains selected peer-reviewed papers which were presented at the Third International Conference on Diffusion in Solids and Liquids (DSL-2007), held at the Hotel Pestana Alvor Praia, Algarve, Portugal during the 4th-6th July, 2007.The goal was to provide a unique opportunity for exchanging information and presenting the latest results, as well as reviewing relevant issues in contemporary diffusion research. The volume includes a special chapter (by J.Delgado) on Heat and Mass Transfer in Porous Media.More than 140 papers, presented by scientists and researchers from more than 25 countries, are included in this special volume. This large number of papers reflects the considerable academic and industrial interest in this topic.
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