Hello I have a recommendation for the idap recommendation, specifically for a howto. I think a great howto would be one that expands on this: http://mattfleming.com/node/190 except going into much more detail outlining every step necessary for it to work. That is a good setup that will give ldap users a good feel for how ldap works as it'll walk users through a real world setup thus making it easy for people to pickup the essential skills necessary to get ldap up and running.