dupecheck icon
DupeCheck - a Mac OS X droplet to identify potential duplicate files

Created with Platypus

Based on this hint on macosxhints.com which contains the history & source of the underlying script. Thanks again to the bash gurus there who vastly improved my original script.

download, unzip, & stick DupeCheck on your Desktop (or wherever).

Drop a file on it and it will use your Spotlight index to see if you have a potential duplicate somewhere.

Released under the GPL.
Icon made with The Gimp