Save File List is a free Automator action that will save the current files and folders list in a text file, so it can be restored later in the workflow or in a different workflow.

Installation: Download the Automator action. You can either select "Import Action..." from the "File" Menu in Automator and choose the action file or manually move the action file to the Automator folder in your Library folder.

NOTE: Save File List is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.