ProximitySync for Mac

From Brad Dolman:

ProximitySync automates the process of keeping the information on your computer and mobile bluetooth device (phone or supported PDA) in sync. ProximitySync can be configured to sync your calendar and address book up to twice per day when your bluetooth device is brought near the computer, or when waking or logging into your computer while the device is nearby. Additionally, ProximitySync provides a menu on your mobile device that lets you initiate a sync with the computer remotely, or get status or change configuration settings. With ProximitySync your mobile device and computer intelligently keep each other up-to-date on any changes made, regardless of where the change originates, and without a moment's thought from you.