[Complete Digital Photography](http://www.completedigitalphotography.com) has release [ACR Version Control](http://www.completedigitalphotography.com/?p=430), a collection of Applescripts and Automator actions for managing multiple versions of Photoshop raw image conversions. The included Automator actions maybe used to create thumbnails and ful-res PSDs of the versions generated by the Applescripts.