Math

• Would You Rather - A blog of real world math problems with no simple answers. Students choose an option and provide justification. Not all math. There's some science thrown in, too.

• Stoodle - A collaborative whiteboard.

Science

• High School Physics Resources - Resources for the students: tutorials, animations, project ideas, sample quizzes, etc.

• Chemicool: (A periodic table with a link to each element)

Social Studies

• Calisphere - University of California (images) 

• American Rhetoric - Offers over 5,000 speeches, many of them as audio or visual files as well as transcripts.

• American Memory - American Memory provides free and open access through the Internet to written and spoken words, sound recordings, still and moving images, prints, maps, and sheet music that document the American experience. It is a digital record of American history and creativity.

• Best of History Websites - This is an award winning site that is designed for history teachers and students. It contains annotated links to over a 1,000 history web sites. 

• The Avalon Project at Yale Law School - Provides primary source documents related to law, history, and diplomacy.