From Reasonable Software House:
You may not realize how many duplicate files you have after downloaded many files from the Internet or duplicate files scattered over your home or corporate network. Duplicate files are usually redundant and unnecessary, so keeping them is merely a waste of valuable hard disk space. Your hard drives may be full of documents, mp3, photos and video and many of them are redundant. NoClone is a file utility that finds and removes true duplicate files by true byte-to-byte comparison, not by CRC. It searches duplicate file contents regardless of filename. Duplicate music (MP3, wma), photos (jpeg, gif), documents and any file type can be searched. With Smart Marker, files are selected for deletion. A search session can be saved. Duplicate files can be deleted, moved, or copied. You can clean up your hard drive and manage files better.