TimeBridge for Mac in wider testing

Timebridge is now testing a connector for Macs running iCal. I wouldn't go so far as to claim, as Timebridge does, that it's the "first scheduling application to integrate with Apple iCal," as Spanning Sync, Calgoo, and Google Calendar's own CalDAV support predate Timebridge for iCal. If someone can explain to me what's so special about Timebridge's Apple iCal "integration," I'd love to know.