Britannica: http://www.britannica.com/
Britannica.com's History & Humanities Desk burrows into the archives to select excerpts on a single subject from throughout the more than 230 years of Encyclopædia Britannica's publishing history. We offer these readings under the heading "Vintage Britannica".
Encyclopaedia Britannica offers much more, of course.

Columbia: http://www.bartleby.com/65/
The Columbia Encyclopedia began its existence in the 1920s when Clarke Fisher Ansley and Columbia University Press recognized the need for a “first aid” for those who read. Now in its sixth edition some 80 years later, The Columbia Encyclopedia continues to serve the purposes for which it was conceived. Containing nearly 51,000 entries (marshalling six and one-half million words on a vast range of topics), and with more than 80,000 hypertext cross-references, the current Sixth Edition is among the most complete and up-to-date encyclopedias ever produced.

Encarta: http://encarta.msn.com/
Your gateway to 17,000 articles, multimedia, a talking dictionary, and our world atlas. The number 1 name in reference suites! In-depth information and groundbreaking multimedia inspire you to explore, discover, and create.

Grolier interactive: http://www.grolier.com/
The Grolier Multimedia Encyclopedia is based on the text of the Academic American Encyclopedia. First published in 1980, the latter quickly established itself as a highly respected reference work. The Academic American was the first encyclopedia to make its text available online, and it was the first to be released on a CD-ROM, which evolved into the Grolier Multimedia Encyclopedia. Now, the Grolier Multimedia Encyclopedia is available directly on the World Wide Web, containing thousands of new and expanded articles, extensive hyper-linking, bibliographies and links to other sources of information on the Web. The Grolier Multimedia Encyclopedia Online is updated monthly.

Nolo's legal encyclopaedia: http://www.nolo.com/encyclopedia/index.html/
Plain English articles on the legal topics that affect you most.

The Encyclopedia of the New Economy: http://hotwired.lycos.com/special/ene/index.html
" the shift to an information economy is redefining how we need to think about both good times and bad. We don't know how to measure this new economy, because the productivity of a decision-maker is harder to grasp than the productivity of someone bolting together cars. We don't know how to manage its companies, because decision-makers can't be told what to do. We don't know how to compete in it, because information seeps so easily. We don't know how to oversee it, or whether it ultimately needs oversight at all. A final thing we don't know is where - or how - the revolution will end. To help inform the architects of this new world, we've assembled an Encyclopedia of the New Economy."

 

ONLINE DICTIONARIES

ONLINE GLOSSARIES

ONLINE ENCYCLOPAEDIAS

ONLINE NEWSPAPERS

ONLINE MAGAZINES

RADIO AND TV