PDFCat for Mac

From Rijdat Software:

PDFCat - Use this utility to keep track of your PDF documents. Just select a folder and this will provide details about any PDF files contained within. Information provided includes: Title, Author, Subject, Keywords, Producer, Creator, Creation Date, Modification Date.

If the file isn't password protected, you can edit this information and save the whole list to an index file. The unregistered version will only index 10 files at a time. Once registered you can deal with up to 2,000 files at once.