I just wanted to let everyone know it's out there. It's called Fast Duplicate File Finder. I'm using it to find EXACT duplicate photos on my machine. It's lightning quick, thorough, nicely designed, novice-user friendly, etc. Unlike the others I've tried this one is set to match photos at 100% match by default. This means the search slows down if you set it to find similar or close matches. But who wants that? I have edited photos I want to keep and it ignores them when set at 100% match. It's great! 
This address will guide you to it http://www.mindgems.com/products/Fast-Duplicate-File-Finder/Fast-Duplicate-File-Finder-About.htm
You can also read about what isn't included with the free version, OS requirements, etc. My only interest was the EXACT match function and that comes with the free version.

This address will guide you to it http://www.mindgems.com/products/Fast-Duplicate-File-Finder/Fast-Duplicate-File-Finder-About.htm
You can also read about what isn't included with the free version, OS requirements, etc. My only interest was the EXACT match function and that comes with the free version.






Also couldn't set it to exact match (100%) which is what I really wanted.
does yours find duplicate audio or music? Does it scan network computers? How about flash or CD/DVD's? Diskettes?
Sorry for the slam Renegade. Maybe you could add some more-user-friendly stuff to the version I tried. Like maybe making the sample scan pics smaller (there seemed to be a lot of unused space around both) and stacking them to one side? Or add an Auto Select to just the 100% matches? 
(One of my favourite pictures!) 




