Access/Information
http://www.access-information.com/

CTRC (University of Colorado)
http://www-libraries.colorado.edu/ps/
ids/ctrc/frontpage.htm

Information Prime NA
http://www.infoprime.com/index.htm

NYPL Express (New York Public Library)
http://www.nypl.org/express

PLUS Information Service (University California, San Diego)
http://gort.ucsd.edu/capplus/plus.html