Another reference just came across my desktop...
The free advertiser-sponsored site.
The subscription site (has some free materials and a link to the free site)

Another article by ZDNet:,4586,2376057,00.html

A quote from this article:

The company will continue to maintain a site for subscribers that will
remain free of advertising ( That site will be aimed mainly at
academic institutions. But the company is hoping to extend the appeal of
that site to younger students. On that site, the company plans to offer
material from Compton's Encyclopedia through a licensing deal with Mattel
Inc.'s Learning Co.


   Elizabeth L. Brown
   Automated Reference Services Librarian
   National Digital Library Program, LIBN/NDL/LC(1330)
   Library of Congress, Washington, DC  20540-1330
   [log in to unmask]                telephone: 202/707-2235

   Library of Congress American Memory Home Page: