This paper reports on a design experiment of web-based curriculum materials explicitly created to help social studies teachers develop their professional teaching knowledge. Web-based social studies curriculum reform efforts, human-centered interface design, and investigations into educative curriculum materials are reviewed, as well as examples of previous efforts to develop educatively scaffolded teaching resources. Three teachers piloted the materials created by the authors, and their experiences are described. The authors then make recommendations for the design of future educative curricula.