Fact Monster, an online encyclopeida, dictionary, and more.
http://www.factmonster.com

Chicago Public Library Ready
Reference Shelf, a variety of sites that feature reference information.
http://www.chipublib.org

InfoPlease, an online encyclopeida, biography search, and more.
www.infoplease.com

The Virtual Desk Reference, variety of useful sites
http://www.stclair.k12.il.us/links/vdesk.htm

The Smithsonian Encyclopedia, links to all kinds of information.
http://www.si.edu/

VirtualTourist, an online travel research exchange. http://www.virtualtourist.com/vt