Apple has released Bluetooth Software 1.5 which offers better support for Bluetooth headsets and printers (6.1MB). You will have to restart your Mac after installing this update.
Headsets must support the Bluetooth headset profile and printers must support the Bluetooth HCRP profile. In order to configure and use a Bluetooth headset, the Bluetooth module must have the latest Bluetooth firmware from the Bluetooth Firmware Updater application version 1.0.2 or later (http://www.info.apple.com/usen/bluetooth/).
For information about using Bluetooth 1.5 or about making your Macintosh Bluetooth-enabled, visit the Apple website at http://www.apple.com/bluetooth/