Education
a. MIT Open Courseware
b. Academic Journals
c. Scholarly e-contents
d. Open Access Journals
e. Digital Library of India
f. Education Portal, Min. of HRD, India
g. Khan Academy
h. Free Video Lectures.com
i. Online Education Database
j. World Resources Institute

Reference resources:

Almanac
a. Information Please Almanac
b. Guinness World Records

Books and Reviews
a. Bookbrowse.com
b. New York Times Books
c. Google Book Search
d. Google Scholar
e. Project Gutenberg

Dictionaries & Thesauri
a. Cambridge Dictionaries Online
b. Free translation.com
c. WordReference.com
d. Cliché Site
e. Merriam-Webster Online
f. Internet Anagram Server

General Searches
a. Answers.com
b. ChaCha
c. Google Earth
d. Google Things to do
e. Internet Archive /Wayback machine
f. PolyCola.com

Language
a. Modern Language
b. BBC-Learning English
c. BBC- Grammar & Pronunciation

Quotations
a. Bartleby.com
b. The Quote Garden
c. Quote World

Measures, Weights, Conversion
a. Convert-me.com
b. Online Conversion
c. Oanda.com

Weblinks to award winning books
a. American library Association-YALSA
b. The Man Booker Prize
c. Nobel prize-Literature
d. Pultizer Prizes