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My ideas:

>Some sort of poll system, with histograms based on results.
>Display of detailed data like "DPI" "Color profile" "bit depth" (PNG-JPEG metadata pretty much)
>Multi-upload (multiple entries with "browse" on the upload section)
>An inline-like "click over to show/compare to other post" for "fixed" images.Would tell instantly if the fix was poor or not.