Apple has released a firmware update for the 2009 Aluminum Apple Wireless Keyboard that improves battery performance when using them in conjunction with other Bluetooth devices such as the Magic Mouse or some Bluetooth headsets. Apple notes that your keyboard must be connected or paired to be able to perform the update. More information regarding installation instructions is available on Apple's Web site. The update is available via Software Update and the Apple Support Downloads page. (Free, 1.14 MB)
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.
2009 Aluminum Keyboard Firmware Update 1.0
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Attempted to install this update on a brand new aluminium wireless keyboard that came with a brand new 21.5-inch iMac. Keyboard was 'stuttering' by repeating random characters without being touched. Firmware version in System Profiler indicated keyboard update was necessary. Bluetooth in System Prefs shows Keyboard is paired, but Firmware Update reports no keyboard. Tried another brand new aluminium keyboard from a recently purchased 27-inch iMac, same result. (Yes, I am in Sydney, Australia, where we spell it aluminIUM).