Encyclopedia.com
Search or browse for short factual articles. Extensive cross references and links to additional sources (some of which charge fees).
How Stuff Works
Illustrated explanations of how things work in the world around us. Clear and easy to understand.
Infoplease.com
Search for or browse for information from Information Please Almanacs, a dictionary, and the Columbia Encyclopedia. Includes extensive biographical information. Special daily features.
Library of Economics and Liberty
Online books and essays (mostly classics) in Economics as well as opinion, links to economic data and institutions, and other recommended links.