r.google.com/]] for gmail users.
Kontact/KOrganizer can use to read the calender created in Google.
In Google Calender
Go to set... alog will pop up, copy the URL given.
In KOrganizer, click add resource, select Calender in Remote file.
Choose a name for the resource.
... nders, yet.
I found a way to export from KOrganizer to Google Calendar, however it has to be done manually each time.
In KOrganizer: File --> Export --> vCalendar (You can try iCale