Nokia 5220 XpressMusic iSync Plugin
Supports syncing contacts and calendars.
Support syncing over Bluetooth, but not over USB.
Tested on Mac OS X version X.5 with iSync 3.0.2. May work with other versions as well.
Copy the bundle
Library/PhonePluginsdirectory (in your Home directory or in the Computer directory, either works fine).
Copyright (c) 2009 Martin Kühl; released under the MIT license.