Apple released the Bluetooth Firmware Updater 1.0.2 which provides "updated firmware for DLink modules revision B2 or later, and Apple Bluetooth internal modules on PowerBooks and PowerMacs."
The Bluetooth Firmware Updater 1.0.2 provides improvements in the update installation process, better performance when waking the computer from sleep, and support for additional key commands during startup.
This firmware update will improve connectivity between the computer and the Apple Wireless Keyboard and Mouse. Use this updater for the modules specified above; this updater is unsupported with any other Bluetooth modules.