From the descritpion:
ldap-abook is an LDAP-based addressbook application, intended for users wishing to maintain a centralized server based addressbook. It provides a schema for an LDAP directory, a Perl library module, and a CGI script. The Web interface is used to view, add, modify, and delete entries. Any LDAP-aware email client (eg. Netscape Messenger, Microsoft Outlook, Lotus Notes, etc.) can be configured to look up email addresses on the LDAP server. The package also includes a Perl script which can be used to dump the directory onto a PalmOS device.
I haven't tested it yet as I'm still beeing attacked by my computer when trying to get pam-ldap to work. Now I'm trying the LDAP-SDK from the mozilla soure so I can compile it. If anyone has managed to get pam-ldap + ol 207 working on a rh7 pls speak up ,)