If you have more please post them and I'll add them to the list and delete your post once they are added.
Other Links that need to be sorted:
http://www.bookrags.com/
http://www.antistudy.com/
http://www.gradesaver.com/
http://www.pinkmonkey.com/
http://www.HomeworkSpot.com
http://www.wikihow.com/Main-Page
http://www.howstuffworks.com/
Books:
http://www.sparknotes.com/
http://www.cliffsnotes.com/
Math:
http://www.algebrahelp.com/
http://www.mathwords.com/
http://www.calculator.com/
Encyclopedias
http://en.wikipedia.org/
http://www.worldbookonline.com/wb/Login?ed=wb
Dictionaries
http://www.webster.com/
http://dictionary.reference.com/
Research Paper Search Engines
http://www.badgerlink.net/
http://infotrac.galegroup.com/itweb/eau11171rpa (Password: memorial)