Encyclopedias

Encyclopedia - Britannica Online
http://www.britannica.com/

Encyclopedia.Com
http://www.encyclopedia.com/

Infoplease: Encyclopedia, Alamanac, Atlas, Biographies, Dictionary, and Thesaurus
http://www.infoplease.com/

Ref-Desk.Com
http://www.refdesk.com/

Wikipedia
http://en.wikipedia.org/wiki/Main_Page


Dictionaries & Thesaurus

Dictionary.Com
http://dictionary.reference.com/ 

Merriam-Webster
http://www.merriam-webster.com/

OneLook Dictionary Search
http://www.onelook.com/

Thesaurus.Com
http://thesaurus.com/