Bartleby.com  Access reference books from the Columbia Gazetteer to Roget's Thesaurus to Gray's Anatomy.

Behind the Name  Get the etymology of names.

Calculator.com

Encyclopedia of Philosophy

Encyclopedia of Television--contains more than 1000 original essays that describe programs and people, historic moments, policy disputes, and special topics.

How Stuff Works

Information Please  Almanacs, dictionary and online encyclopedia.

LibrarySpot  Encyclopedias, maps, online libraries, etc.

Public Agenda Online: The Inside Source for Public Opinion and Policy Analysis  Covers topics from abortion to social security from multiple viewpoints.

RefDesk.com

Zip Code Lookup

World Clock  Time zones.