I recently did a presentation at the June AuckLUG meeting on configuring LDAP and RADIUS centralised authentication solutions.
It’s a little rough (first time I’ve done a presentation on the topic), but hopefully is of use to anyone interested in setting up an LDAP server. In my case I’m using an OpenLDAP server with my self-developed open source LDAPAuthManager tool.
You can watch the presentation (about 2 hours) on YouTube, it includes a lot of verbal and visual demonstrations, so conveys a lot more detail than the slides alone.