From Fedora Directory Server

• Understanding and Deploying LDAP Directory services - Timothy A. Howes, Mark C. Smith, Gordon S. Good - http://ldapbook.com
• LDAP: Programming Directory-Enabled Apps - Mark Smith, Timothy A. Howes - http://ldapbook.com
• LDAP Programming with Java - Rob Weltman, Tony Dahbura
• LDAP System Administration - Gerald Carter - http://www.plainjoe.org/ldap/
  • Has information about integrating with Samba2. Samba3 LDAP integration is very different than Samba2.