To install Gnome 3 on Ubuntu 11.10 start up a terminal and type:
sudo apt-get install gnome-shell
To use Gnome 3 instead of Unity: when you log in, click the “gear” above your password. Select “Gnome”, log in.
After you get tired of “click Activities, find the window you want, click the window” every time you want to switch from one window to another, and you decide you really need a taskbar again to maintain your sanity, start up a terminal and type:
sudo apt-get install tint2 tint2 &
You now have a taskbar again. To get it to appear every time you start Gnome 3 go to Activities > Applications > Other > Startup Applications, then click “Add”, Name: “tint2 task bar”, Command: “tint2″, click “Save”.
Hope you find this useful.