CoverFlow

CoverFlow is another Apple acquisition, and was originally developed as a conceptual iTunes cover art browser:

The original application was able to use locally stored artwork (such as the Synergy database), but couldn’t retrieve artwork from DAAP servers.

Since its inclusion on iTunes (and its announced – and oft criticized – inclusion in the Leopard Finder), it has spawned countless variations.

JavaScript Implementations:

• MooFlow, with Ajax and JSON support.
• A non-animated one (complete with images and CSS for the scroll bar).
• An animated one that squeezes images horizontally
• Another that dynamically zooms images rather than slanting them
• SlideFlow, which requires you to pre-process images

Flash Implementations:

• DisplayShelf (demo)
• A simpler one
• Probably the best one