Apple has released a number of firmware updates for Intel Macs.
These are required if you want to exploit Apple's new Boot Camp software that allows users to transform their Intel Macs into dual boot Mac/Windows machines.
Updates are available for iMac, Mac mini and MacBook Pro computers.
Apple has also released Firmware Restoration software (Firmware Restoration CD v 1.0). It says this software update: "Is used to restore the firmware of an Intel-based iMac (early 2006), Mac mini (early 2006), or MacBook Pro (early 2006) to original factory condition."
These software updates are available from Apple's support pages.