New Book of Knowledge On-line  "The Cool Site for Serious Stuff"

How Stuff Works "a leading provider of information on, uh, how stuff works"

Ready Reference Resources  Peter Milbury's exhaustive list of almanacs, biography and geneaology, dictionaries, encyclopedias, glossaries, government information, handbooks and guidebooks, maps and geography, quotations, statistics, thesauruses, etc.  May be geared more for high schools.

Yuckiest Site on the Internet Don't let the name fool you. May not be geared less for high school :-)

refdesk.com The single best source for facts on the net.  If they don't have it, you don't need it.

Internet Library for Librarians  A portal designed for librarians to locate internet resources related to their profession.