In 2000-2001, the authors derived a 13-category classification system for Web-based educational resources, based on analysis of 199 educational resources recognized as "exemplary" by four national entities. In 2004, we re-examined that classification system, analyzing a stratified random sample of 40 exemplary Web-based resources from the same entities. While the classification system still accommodated categorizing current educational resources, we detected some overlap among categories. Through combination and redefinition, we reduced the number of categories to eleven. This article addresses the initial and modified classification systems, the analysis procedures employed, examples of resources in each category, and future applications of the classification system.