About books, there should be a very good one (I should say ultimative) by Howard Chu, but I don't know about its status.
Until Howard's is ready, this one is a decent place to start:
<http://www.packtpub.com/OpenLDAP-Developers-Server-Open-Source-Linux/book>
I helped edit/review it, which I'll be doing with Howard's, too. ;)
--Quanah
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Quanah Gibson-Mount Principal Software Engineer Zimbra, Inc -------------------- Zimbra :: the leader in open source messaging and collaboration