American Museum of Natural History (Science tab and then Science News for articles )

 http://www.amnh.org/science/

American Museum of Natural History Science Bulletins

http://www.amnh.org/sciencebulletins/

Smithsonian

http://www.smithsonianmag.com/?ref=home

Smithsonian's History Explorer

http://historyexplorer.americanhistory.si.edu/

Project Gutenburg

http://www.gutenberg.org/wiki/Main_Page

The Library of Congress

http://memory.loc.gov/ammem/index.html

http://www.loc.gov/topics/index.php

Bibliomania

http://www.bibliomania.com/

National Geographic

http://www.nationalgeographic.com/

http://education.nationalgeographic.com/education/

Time for Kids

http://www.timeforkids.com/news-archive/all

Primary Sources on the Web

http://www.eduplace.com/ss/hmss/primary.html

Discovery News

http://news.discovery.com/

Science search engine

http://www.scirus.com/

Library of Congress

http://www.loc.gov/index.html

Virtual Library

http://vlib.org/

Kelly Gallagher- Building Deeper Readers and Writers

http://www.kellygallagher.org/resources/articles_archive.html

Award winning site for Poetry
http://gigglepoetry.com/
 
100 Speeches
http://americanrhetoric.com/