An approach for a software tool, the Science and Technology Literacy Desktop, that can organize disparate online educational content into coherent lesson plans, automatically generate links to related reference material, and provide assessment of student comprehension is presented. Based on an enhanced Web browser concept it allows access to a wide variety of material and formats, yet provides the controls necessary for an instructor to administer effective lessons. This software takes a significant step beyond current educational software that lack extensibility to a range of information as broad as that found on the Internet.