Duplicate File Finder
Full user review
"Pretty rough if you have a lot of duplicates!"
Simple interface, fairly quick-scanned 30,000+ files on my largest partition in about 4-5 minutes-then checked the same for dupes in about 7 minutes and found 19,697 dupes, it's able to dig deep into any path, and you're able to choose specific files types or leave field blank to scan all files.
One major problem for me, the results returned are in individual "sets". On my largest drive (see above), you have to go through each set individually. Couldn't find any way around that, gave up when I had to go through 19,000+ sets. It did lock up twice, but it was on the same file each time, so probably my problem not the programs.