BluePhoneMenu 1.2 is a small application that adds Caller ID and SMS functionality to your Mac OS X menu bar and desktop using your Bluetooth enabled phone. BluePhoneMenu keeps a log of who’s called at your fingertips, allowing you to call back or SMS a reply directly from the menu. You can also monitor the current signal strength and battery power of your phone or phones.
Advanced auto-completion lets you call or SMS anyone in your Address Book by typing the first few letters of their first or last name, nickname or email address.
Caller ID can be presented in a full-screen view for maximum visiblilty, in a dialog box for quickly responding, or in the menu bar for minimal interruption. Choose your own ring sounds or have the screen flash; pause iTunes or even launch your own AppleScript.
More info and download link here.