Subform
Subform is a CCK field type that allows inline create/read/update/delete/reference/dereference of child nodes based on some defined "relationships" between existing CCK content types. Child node selection lists are made configurable through views integration (with working filtering and paging), relationship links are bidirectional and support cardinality restrictions, and many options are provided to allow detailed control over how a specific subform field is presented to the user.
Requires enabled external modules CCK and Views, as well as the content_type_reference and persistent_fieldset which are part of the subform install.
This project needs co-maintainers to flourish. Right now it only serves as a proof-of-concept for linking forms of other content types inside an i-frame. For working code, try something like Node Relativity.
