Old instructions that connect the Mac OS X Address Book app to a phone via Bluetooth from O’Reilly and SillyDog. Once paired, the Address Book can initiate dialing, notify the user of incoming calls, and send SMS texts.
Bluetooth Texter SMS Widget, message2net, and BluePhoneElite all offer further tools to interact with your Bluetooth-connected mobile phone. The list of compatible phones (BPE & m2n) offers some leads for those trying to make the connection.
Finally, Simon Winter offers some tips on interacting with SMS via AppleScript.