Googlecl with GUI is an utility to allow you to manage your Google account by using the Google tools in CLI with a GUI.
You can add this script to Nautilus. Just put it in your Nautilus script path and don't forget to do make it executable.
Note: Google calendar is not included, I can't make it work, so if you can, feel free to edit this script.
IMPORTANTE NOTE: Please, run these scripts (one script for each service) once in a term to configure your Google account => http://code.google.com/p/googlecl/wiki/Manual
This script is under the General Public License, so feel free to ameliorate it and share it !