Can't resist giving you a great news, but keep it secret for the moment.

Here, at Firewall-Services we'll begin to develop an LDAP connector in early june. We aim to finish the first step for end of August (some test versions will be availaible before).
Next step will be to be compliant with the AD architecture, but it's for the future.
Any help, suggestion, code contribs or features request are welcome.
RV.
sme.firewall-services.com to have a look at our contribs (sme7admin, backupc, openvpn, ...)