NodeReferrer provides a counter part to CCK's nodereference field. The options for a NodeReferrer field allow you to select content types and field instances to match when creating back reference lists.
Initial Drupal 7 version is mostly stable and tested, The migration from D6 should be discussed in #1834550: Implement content_migrate hooks for nodeReferrer D6->D7
Node and User Reference modules for Drupal 7 can be found at References
There's a work in progress in D7 module Relation