eTHEMES (http://ethemes.missouri.edu/)
eTHEMES is a free searchable database of more than 2500 carefully reviewed online resources for teachers, students, curriculum specialists, librarians, and anyone looking for high quality, kid-safe sites on the Web. Students can use this site for research and teachers can use it to find resources to create Webquests, online lessons, or to find links to high-quality classroom resources.