DoubleKiller

With digital storage and easy file copying, its not difficult to imagine duplicate files cropping up. The issue with trying to weed them out comes along when your not sure if this photo is the one you edited, or the original. Or when you suspect that there are masses of duplicates, you probably don't want to go through comparing the file properties or calculating CRC32-checksums. This is where DoubleKiller comes in.

DoubleKiller gives the options to exclude files, add folders, and select the criteria for comparison(fewer is faster, more is more accurate, but also increases the chances of a false-negative).

You can even select files for deletion from within DoubleKiller, and you can have it select one set of duplicates for deletion if there are more than you feel like checking.

DoubleKiller is available here.