General

• Free Range Librarian (Karen Schneider)
• Librarian by Day (Bobbi L. Newman)
• Librarian in Black (Sarah Houghton-Jan)
• Library Hack School
• Library Journal: Annoyed Librarian
• Library Juice
• Mr. Library Dude (Joe Hardenbrook)
• Virtual Dave...Real Blog (David Lankes)

Academic Libraries

• ACRLog
• Book of Trogool (Dorthea Salo)
• DigitalKoans (Charles Bailey, Jr.)
• Feral Librarian (Chris Bourg)
• The Kept-Up Academic Librarian (Steven Bell)
• Lorcan Dempsey's Weblog
• Open Access news via Connotea
• Scholarly Communications @ Duke (Kevin Smith)
• The Scholarly Kitchen
• Wired Campus

Public Libraries

• Swiss Army Librarian (Brian Herzog)
• Urban Librarians Unite (ULU)

Health Sciences Libraries

• Davidrothman.net
• The Krafy Librarian (Michelle Kraft)
• Mobilehealthnews

Information Technology

• ALA TechSource
• David Lee King's blog
• Hectic Pace (Andrew Pace)
• Librarians Matter (Kathryn Greenhill)
• LITA Blog
• TechEssence.info 
• ShelterIt (Alexander Johannesen)

Other

• Library Law blog (Mary Minow)
• Planet Cataloging

• American Association of Law Libraries (AALL)
• American Indian Library Association (AILA)
• American Library Association
  • ALA Divisions
  • ALA member groups and communities
• American Medical Informatics Association (AMIA)
• American Society for Information Science and Technology (ASIS&T)
• American Theological Library Association (ATLA)
• Association of Academic Health Sciences Libraries (AAHSK)
• Association of College and Research Libraries (ACRL)
  • ACRL Residency Interest Group
• Association of Research Libraries (ARL)
• Association of Rural and Small Libraries (ARSL)
• Art Libraries Society of North America (ARLIS-NA)
• Bibliographical Center for Research
• Chartered Institute of Library and Information Professionals (UK)
• Classification Society of North America
• Council on Library and Information Resources (CLIR)
• Institute of Museum and Library Services
• International Association of Music Libraries (IAML-US)
• International Federation of Library Associations and Institutions (IFLA)
• Iowa Library Association
• International Federation of Library Associations and Institutions (IFLAI)
• Medical Library Association (MLA)
• Music Library Association (MLA)
• National Information Standards Organization
• North American Serials Interest Group
• Online Audiovisual Catalogers
• Special Libraries Association and SLA-Iowa Chapter
• Theatre Library Association (TLA)

To see more, visit the AcademicInfo site.