At LAUSD we set up our mail servers using LDAP (openLDAP) and I know that there were some issues (as you said, intellectual, not technical).
If someone gives me specific examples I will ping the LDAP guru. They know nothing of OpenACS nor Oracle/PG so this needs to be kept in mind.
If I didn't already have to much on my plate I would like to help. In any case let me know if I can help as this would be a huge win for PR and OpenACS
