January 2010
ComparePSD - Compares Photoshop Images Layer-by-Layer - Photoshop - Lifehacker
ComparePSDquickly compares PSD files layer-by-layer, effect-by-effect to find the one you're looking for.—with thumbnails to make it all the easier. It also integrates with the Windows Explorer context menu, letting you select files to compare straight from their folder. Plus, as of today, it's free—ComparePSD is a free download, Windows only
May 2008
Compare and Delete Duplicate Images with DupliFinder
DupliFinder, a free Windows utility, compares digital photos by their name, size, and actual image information to find duplicates you can delete without worrying about."
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