"What is GNOME ?" I think each Linux user should know it ! GNOME is Desktop enviroment that runs on top of a computer operating system. GNOME is a part of the GNU Project and can be used with various Unix-like operating systems, especially for Ubuntu it self. Taken from the official website, Gnome will released the new version of Gnome 3 on Tuesday 5 April 2011. Find out what's new stuff you can find in Gnome 3 here ..
  • Modern, Clear and Beautifull
I'm sure everyone agree with this statement, GNOME 3 looks Modern, Clear and Beautifully  than previous version although some cool effect (mostly desktop eye candy) are left behind permanently. you do not need to worry because GNOME 3 has provide the Mutter Window Manager instead of Compiz, to provide style and some animation effects. Compiz is a compositing manager that can also be a window manager but not active by default.
Gnome 3 Shell Screenshot
  • Built-in Messenger widget
Especially for chatting lovers GNOME 3 bring a good stuff for you, relize that communication is an important part of the modern desktop, GNOME 3 bring this function which let you to continue the conversations without changing focus.
Gnome 3 Messenger Widget Screenshot
  • All in one Menu Panel
The GNOME 3 make a totally change in the part of menu panel, GNOME 3 Panel give a new way to start an Application, search a file and browse some system settings, this new interface make quick and straight forward to find the setting that you want.
Gnome 3 Panel Screenshoot
There are a lot of changes we met in GNOME 3 like a redesigned file manager, redesigned workspaces, and many more. Try it free and feel the new atmosphere of GNOME 3.

How to install GNOME 3 Shell at Ubuntu 10.10
For ubuntu 10.10 (Maverick) user you can test by your self, follow step by step the instruction bellow :
1. Get the Repository then Install it!
sudo deb http://ppa.launchpad.net/ricotz/staging/ubuntu maverick main
sudo apt-get update
sudo apt-get install gnome-shell
2. you can try to using gnome-shell, and replace your current GNOME Desktop Enviroment
gnome-shell --replace
3. If gnome-shell works well in your desktop, you can have it started up by default by changing the /desktop/gnome/session/required_components/windowmanager key from metacity to gnome-shell with gconf-editor.
sudo apt-get remove gnome-session-*
sudo apt-get install gnome3-session