Another wow! about the OS X Panther. I read about it here. Old article I know, but I just got my Bluetooth enabled phone
Basically you do your text messaging from your mac. Incoming calls will also show on your screen (provided the phone is in the neighbourhood of your mac. Incoming messages can be saved in your address book under the caller’s name there. and yes synchronising contacts, ical etc. is a breeze as well! Well done, Apple!