With the goal of using the full power of the World Wide Web for computer-based education, we developed an interactive system for training in dermatology with a database of several thousand color images. The system consists of lecture scripts, case reports with recorded sound, an online atlas, and a quiz system--all relying on the underlying image database. The images used have been reviewed and rated by a senior dermatologist. At present, they are described with a hierarchical key system that permits searching for images by their content. We have evaluated our statistics on access and the results of an open user survey based on an adaptive questionnaire. The responses to 200 questionnaires completed in a two-month study period are encouraging. The online resources are being used not only for training in dermatology but also for continuing education and reference.