Apple’s iTunes has been bumped to version 10.4, receiving no user-level changes but gaining a 64-bit foundation for maximum performance on Mac OS X 10.7 Lion; the update also includes several unspecified performance and stability improvements. Apple notes that, due to the architectural changes entailed by the move to 64-bit, third-party plug-ins may stop working with this version of iTunes; if that happens, contact the individual plug-in developers for help. (Free, 90.23 MB, release notes)
Two Shortcuts for App Exposé
If you want to see all the windows for a particular app via App Exposé, there are two hidden shortcuts. For either, start by pressing Command-Tab to bring up the app switcher. Then, while still holding down the Command key, press either the 1 key or the up arrow. That puts you into App Expose mode, with all of an app's windows showing, and recent documents in a row across the bottom of the screen. Let up on the Command key, and then you can press Tab to cycle through all the running apps.
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