I have released a new module, Popups: Add and Reference, which solves a problem that has been bugging me for years: creating a reference to a node that does not yet exist. The module adds a link to CCK’s Node Reference widget that makes it easy to add a new node without having to leave the edit page. It is built on top of my Popups module.

I have put up a wiki with the current status of my work towards getting popup modal dialogs into Drupal 7 over at http://groups.drupal.org/node/9185