Citation Machine
Enter your source information
and the Citation Machine will prepare your entry for you.
http://citationmachine.net/

Citation Styles for Term Papers
http://www.liunet.edu/cwis/cwp/library/workshop/citation.htm

Elements of Style  Writing Guide
(http://www.bartleby.com/141/)

Bova's Writing Page:
Miscellaneous Guidelines for Research Papers
http://www.dickinson.edu/~bova/write.html

yourDictionary.com
(searches 870 dictionaries & foreign languages)
http://yourdictionary.com/
 

Merriam-Webster's Word Central
(very kid-friendly)
http://wordcentral.com/

Merriam-Webster Dictionary
http://www.m-w.com

Cambridge Dictionaries Online
(includes examples of words in sentences)
http://dictionary.cambridge.org/

Chemistry &  Environmental Dictionary
http://environmentalchemistry.com/yogi/chemistry/dictionary/

Babel Fish
(translates blocks of text or whole webpages)
http://babelfish.altavista.com/

Fact Monster: Online Almanac, Dictionary and Encyclopedia
http://www.factmonster.com/

World Almanac for Kids
http://www.worldalmanacforkids.com/index.html

MapQuest
http://www.mapquest.com

Daily Stocks
http://quote.dailystocks.com/market.asp?code=xdaily

Finding People & Businesses
http://www.switchboard.com