File Comparator is your best friend for finding and managing duplicates on your Mac. Just drag and drop the folder that you want to inspect and run the analyzer. File Comparator looks for empty files and folders, and for broken aliases. It's easy and lightning-fast. Choose to run automatically, or run a custom analysis by choosing up to 56 options for images, audio files, and/or regular files.
Note: Now requires OS X 10.7 or later running on a 64-bit Intel processor