The module is now able to do single nodereferences.
A bug is fixed when using the module with multiple instance on the same node type.
The module gained performance by reducing the amount of queries executed.
The nid of a deleted node still existed in the tables. CCK deleted the nodes in the nid field but apparently not in field_'ref_name_field'_nid.
The module as of version 6.x-1.8 now deletes these rows too. So no other node references content field table has rows where the reference field points to a non existing node.