Dear David,

I have used iCalendar exporter to export an important schedule
on orgmode.
So it is org-mode -> iCalendar.

Actually, I use this exporter with Dropbox service.
1. Export a iCal file to Dropbox directory
  (Dropbox will upload the file to the internet automatically)
2. iCal.app on Mac get the iCal file from the internet,
   and display the schedule as a special item.