Read and write support for Google Calendar checked in
A very nice checkin has just hit the Mozilla source code. Support for read and write of Google Calendar. So now both Lightning and Sunbird has support for Google Calendar. Please note that the support currently is minimal but it's being worked on. It's being build as an extension.
And no, I dont know where to get this extension. I dont think it's getting build right now. So you have to wait for more information.