I know nothing about LDAP, but I wanted to throw in that Dropline installs OpenLDAP. Note that it also installs PAM, which many people seem to have a problem with. There may be some help in their forums, though a quick search of their forums gave me only this http://www.metaconsultancy.com/white...ldap-linux.htm
, with a note that the PAM section was the interesting part.
Just thought I'd add that, since Dropline has some nice stuff for people looking to move away from Windows in the market place, i.e. OpenLDAP, Evolution. Plus, it uses HAL/DBUS, which is pretty slick when you want to add new devices.