IBM Redbook: Understanding LDAP - http://www.redbooks.ibm.com/abstracts/sg244986.html Basic principles and concepts of LDAP. Minimum product-related or vendor-specific information.
IBM Redbook: Using LDAP for Directory Integration - http://www.redbooks.ibm.com/abstracts/sg246163.html Explains directory and LDAP concepts and tasks. Contains examples based on IBM SecureWay, Lotus Domino and Microsoft Active Directory.
Wanderlist: LDAP Resources - http://www.wanderlist.com/ldap/ List of links to LDAP resources, ranked by most votes received by site visitors.
What is LDAP? - http://www.gracion.com/server/whatldap.html Brief overview of LDAP, with links to further resources.
Wikipedia: Lightweight Directory Access Protocol - http://en.wikipedia.org/wiki/Lightweight_Directory_Access_Protocol Encyclopedia article about the protocol, including origins and influences, terminology, and technical information.
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