How to create node and reference it in Drupal 7?
http://drupal.org/project/noderefcreate

This one is available for D7, and allows you to create &amp; reference nodes within the create / edit form for another node type. Unlike the popups_reference module, it will only allow you to create the extra nodes with titles (no other fields). You could, however, use this and then write a small custom module that uses hook_form_alter() to redirect the user to the edit forms for newly-created nodes to enter the rest of the information.

Not as nice as popups_reference, but it should work.