After I heard that Gnome 3 is quite good i wanted to give it a try. I currently use Kubuntu (KDE) so the base system was already installed. And following this article i installed Gnome 3 additionally.
1. sudo add-apt-repository ppa:gnome3-team/gnome3
2. sudo apt-get install ubuntu-gnome-desktop ubuntu-gnome-default-settings
3. sudo apt-get install gnome-documents gnome-boxes
The first step adds a few updated components and is not really necessary. The third step installs additional components.
Afterwords you can choose Gnome as Session and use it. There are a few thinks I needed to do in order to make it usable for me:
1. aptitude install account-plugin-icq
Installs ICQ Support
2. gsettings set org.gnome.shell.overrides workspaces-only-on-primary false
This sets the right screen on a multi monitor setup to also switch between workspaces. I was going crazy with the fixed right screen.
3. dconf write /org/gnome/gnome-session/auto-save-session true
Otherwise your applications will not be restored after logging in. There was an option if you run "gnome-session-properties" via ALT+F2 but the option is now missing.
Additionally you need to add an environment variable to ~/.profile.
As i found out also that will not help. They removed the functionality a long time ago. An Operating System that is not able to restore a session in in my opinion not really an Operating System you can work with. So far it seems like old Gnome Versions, KDE, Xfce keep this functionality (this list may not be complete).