I just tried Easy Duplicate Finder from Zookie's list. Unfortunately, I was not happy with it and I uninstalled it pretty quickly.
It's annoying how hard it tries to make you buy the full version. Even on uninstall, it opened a web page that offers you the full version at a discount.
As for it's features, it's not as simple to operate as Awesome Duplicate Photo Finder, and though it seems to find dupes just fine, it doesn't show the pictures for comparison like the prior program. It's more a general dupe file finder program though, it will look for dupes for almost every file type under the sun, so perhaps it's that non-specialization that makes it a fail for me there.