I'm trying out this new duplicate image finder software that appears to work like TinEye-- it looks at the pixels rather than file name or hash. It is scanning my drive now. It's been about an hour and it has scanned 14,000 out of 24,000 images and found 3700 similars. I am guessing it doesn't "see" RAW files, but it does "see" DNG so there's a case for DNG conversion as a matter of course in asset management.
I'll report back when the thing is done and let you know how well it works and how useful it is. Having something like this working with picasa or lightroom would be hella awesome.
awesome duplicate photo finder