Depending on your interests, the following sites provide subject specific information.
Cataloging information - Cataloger's Reference Shelf
Children's books in various languages - International Children's Digital Library (ICDL)
Conservation and preservation - CoOL Conservation OnLine
Research and grant support to museums and libraries - IMLS Institute of Museum and Library Services
Directory of libraries worldwide (Library Technology Guides) - Libraries.org
Products and services used in libraries - Library Technology Guides
Instruction and information literacy - LOEX
Self-paced courses and webinars - WebJunction
The following guides and sites offer detailed information about open access.
Open Access Directory - hosted by Simmons University's School of Library and Information Science
Sherpa Romeo - includes publisher and journal open access policies from around the world