GNOME 3 is the next evolution of the GNOME desktop environment, and it has been released on April 6th, 2011, on mirrors worldwide. GNOME 3 is a light desktop environment used in many popular Linux distributions, such as Ubuntu, Mandriva, PCLinuxOS, etc.
We've tested the tutorial on the beta version of the upcoming Ubuntu 11.04 (Natty Narwhal) distribution. To install GNOME 3 on your system follow the next step-by-step (with screenshots) tutorial.