Wirelessly Sync Your iPod's Calendar With Google Calendar
I have successfully been able to use PHP to read and write to the iPod's calendar database. I then load the Google Calendar's events and compare them to see what has been deleted on the iPod and Google Calendar. Then do actions accordingly. The only problem is knowing what to do if an event was modified both on the iPod and at Google Calendar.
These details are provided for information only. No information here is legal advice and should not be used as such.