Encyclopedia Britannica: Brings you links to the best Web sites, leading magazines, related books, and the complete contents of the Encyclopedia Britannica!
U.S. Census Bureau: Population statistics and more
Measure 4 Measure: A collection of interactive Web sites that estimate, calculate, evaluate, translate, etc.
Yahoo Directory of Quotations: quotations, quotations, quotations
Word Play: an ENORMOUS list of sites that that deal with words - anagrams, acronyms, homonyms, mnemonics, animated sign language dictionary, translators, etc.
Thesarus.com: Look up synonyms here. Site also includes crossword and word search puzzles, a translator, the word of the day, and a dictionary that searches many on-line dictionaries and returns to results.