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A stack with enough icons to require scrolling - OS X 10.5 wouldn't have displayed all of these

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Dock Exposé showing all the windows open in Safari

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The same windows, now ordered alphabetically

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Minimised windows appear separate from active ones in Exposé

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A PDF previews in its icon

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Pages can be turned without opening the PDF

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A video file as you might expect to see the icon normally

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Playing a video file from its icon, expanded to a reasonable size

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An MP3 file playing in icon preview

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QuickTime's recording options

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Publishing a movie to YouTube from QuickTime is as simple as entering your login details

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Movies can be exported to different devices in appropriate formats, quality and file sizes