MedBioWorld:
The largest site for medical and bioscience journals, associations and databases.
http://www.sciencekomm.at/

Listservs:
Most of the URLs on this page came from members of the DocDel listserv. An open group of over 1,000 members dedicated to the topic of document delivery.
http://www.docdel.net/docdel.html

Patents:
Internet access to bibliographic and full-text U.S. patent databases reaching back to 1976.
http://www.uspto.gov/patft/

Books:
Z39.50 searching of remote databases and library catalogues.
http://www.webclarity.info/products/overview_bookwhere.html

Company Information:
Instant Information on some 13,500 public and private companies worldwide.
http://www.hoovers.com

Stock Filings:
Access to real-time filings with the Security and Exchange Commission.
http://www.edgar-online.com/

Public Records:
"The most comprehensive source of public records on the Web."
http://www.knowx.com

Standards: A National Resource for Global Standards
http://www.nssn.org/
the American Society for Testing and Materials
http://www.astm.org/

Document Delivery and Interlibrary Loan Services Guide:
The DDILSG serves as a free training resource for practitioners of document delivery and interlibrary loan, and also includes news and position announcements.
http://www.ddill.org/

Libdex: is a worldwide directory of over 18,000 library homepages and web-based OPACs.
http://www.libdex.com/