In response to training and information needs of the public health workforce, the New York City Department of Health and Mental Hygiene, in collaboration with the Department of Biomedical Informatics, Columbia University and the New York Academy of Medicine, is developing a series of on-line, interactive tutorials in public health informatics. The goal is to teach public health practitioners how to locate, use, and disseminate data and information on the Internet, while imparting basic informatics principles. Course content is based on Public Health Informatics Competencies, and evaluation will be performed by measuring changes in self-efficacy and knowledge as well as determining user satisfaction.