Instead of using Photoshop, why not give Apple's Aperture a try? Aperture is designed more for post-production work for professional photographers, letting you cull through shoots, enhance images, manage massive libraries, and deliver stunning photos.
Watch this video tutorial on how to work with metadata in Aperture. With Aperture, you can build a library of tens of thousands, or even hundreds of thousands of images. By creating a large library, it's of limited value if you can't easily find and organize all of those images. Find, manage and display your images with Aperture's powerful metadata tools.
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