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Quick View popovers in Spotlight, Stacks
The new Spotlight-integrated Quick View is reminiscent of Google's search results previews; simply mouse over results and previews (or additional information, for items that can't be previewed) are displayed as a popover.
Popovers are a relatively new user interface convention Apple began using in Snow Leopard's iCal to associate and tie information that would normally be presented in a floating panel window with a specific item on the screen.
Apple has also made significant use of popovers in the iOS interface, particularly on iPad where presenting or setting information about an item in a popover makes the new 'cartoon speech bubble' concept a perfect fit for the simplified computing experience of the hands-on iOS, without necessitating any additional user interface chrome to close, adjust, or manage the specialized new windows.
In Lion, popovers now provide a Quick View of Spotlight search results, including documents, web pages, contacts, emails and media files, and can also expand word definitions via Dictionary or present metadata for apps, preference files, and other items that offer nothing to preview.
Quick View popovers are also visible from within Stacks, allowing users to target items with the mouse or arrow keys, and then hit the spacebar to present a preview or more information about the item.