OpenSuSe user can install Googsystray using "1-click" installer - here
To install Googsystray in some other Linux distro, firstly make sure you have Python and pygtk installed, then download the .tar.gz archive and extract it. Open a terminal, navigate to the folder where you have extracted Googsystray, and run the following command:
sudo python ./setup.py installThen, go to the bin subfolder from your googsystray folder, and double click the googsystray file.
To configure Googsystray, right click it's icon on your systray and select "Preferences":
To open an unread message, left click the service icon (Gmail, etc) in your systray (notification area).