Excellent 'Libraries Information' sites.

The home page of the Mathematics Archives - A comprehensive site for mathematics on the Internet
Penetration:  
Bookmarked: February 07, 2007 06:02:01 · Details
URL: archives.math.utk.edu

The Library of Congress collections include over 110 million items in a variety of formats and languages. The catalog information for many of these items has appeared in a number of traditional card catalogs located in the Library. Much of the information in these catalogs is also searchable over the Internet. This page links to the two methods for search the main Library of Congress Online Catalog and to several specialized catalogs for prints and photographs (PPOC), for sound recordings (SONIC) and a Z39.50 gateway to the main catalog data.
Penetration:  
Bookmarked: February 10, 2007 01:02:54 · Details
URL: catalog.loc.gov

Www.acm.org - The premier society in computing brings you the Computer Portal.
Penetration:  
Bookmarked: February 19, 2007 17:02:35 · Details
URL: portal.acm.org/dl.cfm

Find a business near you on the Switchboard.com Yellow Pages. Your Digital Directory.
Penetration:  
Bookmarked: December 21, 2007 16:12:17 · Details
URL: www.switchboard.com/bin/cginbr.dll

Mail.com the best personalized free web-based email
Penetration:  
Bookmarked: December 21, 2007 17:12:31 · Details
URL: www.mail.com/mailcom/index.jhtml

The Library of Congress. The Library of Congress is the nation's oldest federal cultural institution, and it serves as the research arm of Congress. It is also the largest library in the world, with more than 120 million items. The collections include books, sound recordings, motion pictures, photographs, maps, and manuscripts.
Penetration:  
Bookmarked: January 08, 2006 23:01:43 · Details
URL: www.loc.gov

A global directory of library home pages
Penetration:  
Bookmarked: August 20, 2005 09:08:12 · Details
URL: sunsite.berkeley.edu/Libweb

The National Library of Medicine (NLM), on the campus of NIH in Bethesda, Maryland, is the world's largest medical library. It collects materials in all major areas of the health sciences and to a lesser degree in such areas as chemistry, physics, botany and zoology. The collections stand at 5 million items--books, journals, technical reports, manuscripts, microfilms, photographs and images. Housed within the Library is one of the world's finest medical history collections of old (pre-1914) and rare medical texts, manuscripts, and incunabula.
Penetration:  
Bookmarked: February 11, 2007 09:02:13 · Details
URL: www.nlm.nih.gov

Information about the programs, services, and collections of The New York Public Library, along with access to its catalogs and other information databases."
Penetration:  
Bookmarked: February 17, 2004 10:02:58 · Details
URL: www.nypl.org

Home page of the University of Houston Libraries
Penetration:  
Bookmarked: February 19, 2007 05:02:25 · Details
URL: info.lib.uh.edu/index.html