UPDATE: Version 1.1 is now available. It includes keyboard backlight effects.
MacSaber 1.0 Final has been released. This new version includes support for iBooks and PowerBooks equipped with SMS. It also includes a “Check for updates” menu item and debug output if you are having problems (the report button is not yet available).
iBook: SMS only exists on iBooks built after July 26, 2005. These iBooks are either 1.33GHz or 1.42GHz. All 1.42GHz iBooks have SMS. Only 1.33 GHz iBooks with a scrolling trackpad, 512MB RAM (stock), and 40GB HDD (stock) have SMS.
PowerBook: SMS only exists on PowerBooks built after January 31, 2005. These PowerBooks are either 1.5GHz or 1.67GHz. All 1.67GHz PowerBooks have SMS. All 1.5GHz PowerBooks without backlit keyboard have SMS. 1.5GHz PowerBooks with both backlit keyboard and the 8X superdrive have SMS.