This article is from the Libraries FAQ, by Anthony Wilson firstname.lastname@example.org with numerous contributions by others.
It would be impossible to list all the web sites that might interest
librarians, but here are some of those sites many librarians cite as
being the most useful:
Besides providing links to acquisitions and collection development
information, Acqweb features the Diversion of the Month & a Hot Topics
BUBL Information Service
The extensive Internet-based information service run from the
Andersonian Library at the University of Strathclyde.
Info Connect for Librarians
A searchable, alphabetical directory of resources for librarians and
information scientists. http://www.users.dircon.co.uk/~kush/Page1.htm
Internet Library for Librarians
"A comprehensive Web database designed to provide a one-stop shopping
center for librarians to locate Internet resources related to their
Internet Public Library
The IPL, hosted by the School of Information & Library Studies of the
University of Michigan, is working to create a strong, coherent sense
of place on the Internet by finding, evaluating, selecting,
organizing, describing, and creating quality sources of information.
The Librarian's Bookmarks
One of my favorite places to browse.
Librarians' Index to the Internet
This was formerly known as the Berkeley Public Library Index to the
Internet; possibly the most comprehensive site on the net.
LibraryLand, Resources for Librarians
The well organized site of the Ramapo Catskill Library System.
Library-Oriented Lists and Electronic Resources
A compilation of electronic discussion lists, distribution lists and
electronic serials, which are of interest to library professionals and
Librarian's Home Page Directory
Librarians listed by name and specialization; this page can be helpful
in locating esoteric information.
Librarians' Site du Jour
Part of Jenny's Cybrary to the Stars.
Libweb - Library Servers via WWW
An excellent directory of Library home pages; lists over 1700 pages
from libraries in over 70 countries.
UK Public Libraries Page
The aim of these pages is to present the most complete and up to date
picture of public library internet activity in the United Kingdom.
Interesting ideas for exploiting the Net in promoting your library can
be found in the Net Notions section.