Ubuntu 11.04 Change From Unity To Classic Gnome
http://scottlinux.com/2011/03/05/ubuntu-11-04-change-from-unity-to-classic-gnome
Classic Gnome fans, fear not. You can still use standard Gnome in
Ubuntu 11.04 if Unity is not your
bag.
To change to traditional Gnome, logout and then after clicking
on your username, select Ubuntu Classic
Desktop at the bottom of
the login screen.
Enjoy the latest and greatest Ubuntu with regular Gnome!
Edit! Alternate method:
Click the Power icon > System Settings
Find and click on Login
Screen where you can set
your default session as well.
Edit2! Or why not try KDE:
http://www.kubuntu.org/news/11.04-release
Install KDE with:
$ sudo apt-get install kubuntu-desktop