As libraries are embracing all that Web 2.0 has to offer, many library wikis have sprouted up on the web.

Example of Libraries Utilizing Wikis 

Lamar Guides

Lamar University's Mary and John Gray Library offers links to various library pathfinders for faculty, staff and students.  Research guides, Subjects page, and Database page are all well done and fairly user-friendly, with links to "Quick Guides" for using the library resources.  You have to click on "Show all pages" to find these options.

PAMS Reference

North Carolina State University's Physical and Mathematical Sciences Library wiki, with resources listes by subject, resource formats, courses, etc.

Ohio University BizWiki

"A collection of business information resources...designed to assist business researchers in finding the best resources for their projects or topics."

PALS RefWiki

A "is a reference tool for members of the Prairie Area Library System to use and build."  This site is a work-in-progress.  The layout is good, but not all categories contain infomation. 

Best Practices Wikis

Online Reference

Part of Library Success, a Best Practices Wiki, this covers much discussion of various software options, as well as listings of libraries that use these various technologies.  Also links to other blogs and websites to watch.

Library Instruction Wiki

The Oregon Library Instruction Wiki provide many resources for librarians looking for tips, tricks and ideas for library instruction.

General Library and Tech Wikis

Virtual Reference Special Interest Group Wiki

This wiki links to other library wikis, discusses wiki basics for librarians, links to individual and conference wikis and much more.

LIS Wiki

"LISWiki was established to give the library community a chance to explore the usefulness of Wikis."

Blogging Libraries

A Collection of links to a variety of blogging libraries, including academic, public, school, special and more!

Social Library Lurkers

A wiki devoted to social networking and web 2.0 technology like wikis, blogs, RSS feeds, social bookmarking, and much more!

Includes links to courses on Five Weeks to a Social Library.