Apple released a handful of firmware updates for the MacBook, MacBook Air, MacBook Pro, iMac, and aluminum keyboard Tuesday evening. The updates address several issues including stability, and the keyboard update addresses an issue where extra characters appeared when typing.
iMac EFI Firmware Update 1.3, MacBook Air EFI Firmware Update 1.0, MacBook EFI Firmware Update 1.5, and MacBook Pro EFI Firmware Update 1.5 all address issues related to overall stability. The Aluminum Keyboard Update 1.0 is available for both the wired and wireless versions of the keyboard.
The updates are available via the Software Update application, or as downloads at the Apple Support Web site.