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Might not be realistic?
I was thinking along the lines of a perl script comparing MD5 hashes until I read your requirement that it should be able to cope with cropped and resized images...
This might be too much to ask.
When you crop or resize an image you lose the information that makes such a comparison possible. If there was software that did this it would surely be based on some kind of heuristic and would only be an educated guess at best.
To understand how difficult this is, try to imagine how you would say FOR CERTAIN that two pictures were "the same" even though one had been cropped or resized... they might look roughly the same, but what about the palette, the brightness adjustment, colour filters, skewing, etc etc etc...
Not to mention site branding...
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