http://drupal.org/project/noderelationships

This module really surprised me how well it worked and the features it offers. Relating nodes, creating new nodes on the fly as you relate them, search interface that uses Views etc.

The install was tough cause it needs modalframe with then needs jquery_ui 1.7 see notes here
http://drupal.org/node/855836

View the video here: http://blip.tv/file/3889945