Apple has quickly issued MacBook Pro (Retina) Trackpad Update 1.0 for its just-released MacBook Pro with Retina Display to address an issue that affected the trackpad’s responsiveness (see “New MacBook Pro Features Retina Display, Flash Memory,” 11 June 2012). The updater will be installed into the Utilities folder within your Applications folder, and will launch automatically. (Free, 1.26 MB)
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Use Shift to Compare Edits in iPhoto '08
In iPhoto '08, while you're editing a photo, press the Shift key to see a "before" view; let it up to see the "after" view. It's much faster and easier than using Undo and Redo.