We have now enabled LDAP Logging on Release builds on the trunk and the 1.8.1 branch (aka SeaMonkey 1.1.x/Thunderbird 2.0a 0.0x and 2.0blater)
The LDAP logging can be used to view the messages that the Address Book is sending and receiving to/from your LDAP server. We hope that this will aid debugging problems on an LDAP link.