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Apple has been busy and made a number of firmware updates available. You can obtain the relevant updates through OS X's Software Update or manually visit the following URLs:
Aluminum Keyboard Firmware Update 1.0
iMac EFI Firmware Update 1.3
MacBook Pro EFI Firmware Update 1.5
MacBook EFI Firmware Update 1.2
MacBook Air EFI Firmware Update 1.0
Aluminum Keyboard Firmware Update 1.0
Apple said:Whats New in this Version
This firmware update addresses an issue with the aluminum Apple Keyboard and the aluminum Apple Wireless Keyboard where a key may repeat unexpectedly while typing. The update also addresses other issues. Mac OS X 10.5.2 is required before installing this update.
The update package will install an updater application into the Applications/Utilities folder and will launch it automatically.
Connect your aluminum Apple Keyboard before following the instructions in the updater application to complete the update process.
If you are installing from a MacBook or a MacBook Pro, your computer's power cord must be connected and plugged into a working power source.
iMac EFI Firmware Update 1.3
Apple said:About iMac EFI Firmware Update 1.3
This update fixes several issues to improve the stability of iMac computers.
After the firmware is successfully applied to your Mac, your Boot ROM Version will be:

IM71.007A.B03
You can confirm the version of the BootROM installed on your computer using System Profiler.
To complete the firmware update process, please follow the instructions in the updater application (/Applications/Utilities/iMac EFI Firmware Update.app). The updater will launch automatically when the Installer closes.
For more information about firmware updates for Intel-based Macs, please visit: http://docs.info.apple.com/article.html?artnum=303364
MacBook Pro EFI Firmware Update 1.5
Apple said:About MacBook Pro EFI Firmware Update 1.5
This update fixes several issues to improve the stability of MacBook Pro computers.
After the firmware is successfully applied to your Mac, your Boot ROM Version will be:

MBP21.00A5.B08 or MBP31.0070.B07
You can confirm the version of the BootROM installed on your computer using System Profiler.
To complete the firmware update process, please follow the instructions in the updater application (/Applications/Utilities/MacBook Pro EFI Firmware Update.app). The updater will launch automatically when the Installer closes.
For more information about firmware updates for Intel-based Macs, please visit: http://docs.info.apple.com/article.html?artnum=303364
MacBook EFI Firmware Update 1.2
Apple said:About MacBook EFI Firmware Update 1.2
This update fixes several issues to improve the stability of MacBook computers.
After the firmware is successfully applied to your Mac, your Boot ROM Version will be:

MB31.008E.B02
You can confirm the version of the BootROM installed on your computer using System Profiler.
To complete the firmware update process, please follow the instructions in the updater application (/Applications/Utilities/MacBook EFI Firmware Update.app).
The updater will launch automatically when the Installer closes.
For more information about firmware updates for Intel-based Macs, please visit: http://docs.info.apple.com/article.html?artnum=303364
MacBook Air EFI Firmware Update 1.0
Apple said:About Mac BookAir EFI Firmware Update 1.0
This update fixes several issues to improve the stability of MacBook Air computers.
To complete the firmware update process, please follow the instructions in the updater application (/Applications/Utilities/MacBook Air EFI Firmware Update.app). The updater will launch automatically when the Installer closes.
After the firmware is successfully applied to your Mac, your Boot ROM Version will be:

MBA11.00BB.B03
You can confirm the version of the BootROM installed on your computer using System Profiler.
For more information about firmware updates for Intel-based Macs, please visit: http://support.apple.com/kb/HT1244