eThemes - An extensive database of content-rich, age-appropriate resources organized around specific themes. These resources are created for educators to use in their classrooms.
The Internet Public Library - The Internet Public Library is a public service organization and a learning/teaching environment founded at the University of Michigan School of Information and hosted by Drexel University's College of Information Science & Technology.
Best of the Web - A comprehensive directory categorizing content-rich, well designed websites on many topics.