If anybody wants to try it, google_contacts is now ready for testing.
It syncs in both directions with google.
The latest version is available here...
http://sourceforge.net/projects/roundcubegoogle/files/ [1]
Be sure to read the README before using.
[1] http://sourceforge.net/projects/roundcubegoogle/files/
List info: http://lists.roundcube.net/dev/ BT/aba52c80