Here is a list of encyclopedias with links to their websites, which you may find useful. The annotation may help you determine which ones are more relevant to your research and/or projects.
This is an online version of the current (year 2000) edition of the Columbia Encyclopedia, a one volume, short-entry encyclopedia with over 50,000 entries.
An annotated listing of subject-oriented encyclopedias available on the Web.
"Based on The Concise Columbia Electronic Encyclopedia, Encyclopedia.com provides current information available in all major fields of knowledge -- from politics, law, art, and history to sports, literature, geography, science, and medicine. More than 17,000 articles provide free, quick and useful information on almost any topic. Through extensive cross-referencing, users have the option of expanding their research through direct links to other articles within the Encyclopedia.com site and to other related web sites." Note: the articles are rather short, and although the basic articles are free, they contain links to materials from the Electric Library, for which a fee is charged for access.
Information Please Almanac
Online version of the popular almanac, which you can browse by topic or search. Also includes the Random House Webster's College Dictionary and the Columbia Encyclopedia.
A free encyclopedia that anyone can edit.