Spanning Sync is an application that provides synchronization between iCal and Google Calendar. The application is currently in limited private beta. The latest build is 1.0b3 which I installed this morning. The application installs in the OS-X System Preferences application. There is not a lot to configure here. 
Enter your Google Calendar account name and password. Select the iCal calendars you would like to sync, the sync frequency and click Sync Now. The “Reset” button gives your the options of resetting the local iCal or Google Calendar entries.
So far I have not encountered any bugs using the application and I expect that we shall be seeing a completed product soon. There is no indication of whether the developers intend to commercialize Spanning Sync.
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