I've looked at the thread at
[SOLVED] Problem with LDAP connection
and the notes at
Ajcody-LDAP-Topics - Zimbra :: Wiki
Zimbra Directory Service (LDAP) - Zimbra :: Wiki
But I'm not able to get the information on Zimbra's container and other object setup, to be able to configure the sync from it Google Apps. I'm not able to tell, even, what username needs to be entered in phpldapadmin (though I believe I have the right password) to login via that tool to look around.
Does anyone out there have knowledge in this area?