100 Unbelievably Useful Reference Sites You’ve Never Heard Of | Teaching Tips

"Beyond Google, Wikipedia and other generic reference sites, the Internet boasts a multitude of search engines, dictionaries, reference desks and databases that have organized and archived information for quick and easy searches."
http://www.teachingtips.com/blog/2008/07/07/100-unbelievably-useful-reference-sites-youve-never-heard-of/bly