Yet another update appearing in Software Update on Macs Wednesday was the Bluetooth Firmware Update 2.0 (a 1.6 megabyte download).
This update provides bug fixes and better compatibility with the Apple Wireless Mighty Mouse and Apple Wireless Keyboard. It installs on all Macintosh systems with Bluetooth based on the Broadcom chipset.
The update can be applied through Software Update or downloaded as a stand-alone installer from Apple’s web site here.