Metropolitan New York Library Council Directory 
Libweb
8000+ libraries in 146 countries
Lanic (Latin American Network Information Center)
A directory of organizations produced by the Lozano Long Institute of Latin American Studies (LLILAS) at the University of Texas at Austin. In English, Spanish and Portuguese.
Note: directory of organizations
WorldCat.org 
Free union catalog containing the holdings of thousands of libraries. Use the Find-it at CUNY feature to look up titles in the CUNY library system and to make ILL requests. Mobile WorldCat: http://www.worldcat.org/m/
Note: free catalog of the holdings of thousands of libraries; request ILL items with find-it
WorldCat (FirstSearch) 
Holdings of thousands of American and international libraries. Make ILL requests with the Find it! button. Searchable in English, French, and Spanish. See an online tutorial to the database. See also the freely accessible version of WorldCat. Database Guide (PDF)
Note: holdings of thousands of libraries; make ILL requests through Find it!
KVK Karlsruhe Virtualler Katalog
Searches European, North American, Australian, and Israeli library catalogs and databases simultaneously
The European Library
Searches European national library catalogs; maintained by The National Library of the Netherlands.
MENALIB (Middle East Virtual Library) 
A megasearch site for Middle East and Islamic Studies, sponsored by the German Research Foundation, providing access to online information and to digital records of printed and other offline media and thus supports the concept of a hybrid library for Middle East and Islamic Studies.
Note: megasearch site for Middle East and Islamic Studies
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Mina Rees Library