Center for Education Policy (CEP) - This site highlights certain topics both current and past to help the intellectual development of students in elementary and secondary schools and focuses on chemistry, physics, math, and biotechnology.
PBS TeacherSource - PBS brings you education resources by curricular subject, topic and grade level and standard; in-depth online professional development through PBS TeacherLine; tips on how to effectively teach with technology; PBS television programs with extended taping rights for educators; convenient tools for teaching, such as recommended books and web sites; interdisciplinary teaching suggestions; free weekly electronic newsletter highlighting TV and online programming from PBS.
Education World - Database of education web sites, includes "Cool School of the Week" contest.
Google Scholar - Google provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: peer-reviewed papers, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations. Google Scholar helps you identify the most relevant research across the world of scholarly research.