Diamond electrodes offer superb properties for a variety of electrochemical technologies, properties that include: corrosion resistance, low background current, good responsiveness without pretreatment, resistance to fouling, and optical transparency. Electroanalysis, electrocatalysis, spectroelectrochemistry, and bioelectrochemistry are areas of electrochemistry in which diamond thin-films, both microcrystalline and nanocrystalline, are being successfully researched. A brief review is given herein of some of our R&D efforts in each of these areas. (C) 2003 Elsevier B.V. All rights reserved.