What is new in version 1.8
Nemo received a lot of attention. Its user interface was heavily modified and its behavior was adapted to integrate better with Cinnamon.You can now easily hide the sidebar and switch back and forth between places and treeview. Under each place, if applicable, a small bar indicates how much space is used.
Cinnamon now features its own screensaver. One of its particularities is that you can define an away message before locking up your screen.
All configuration modules are now present in Cinnamon Settings. You no longer need to use Gnome Control Center.
KDE calls them Plasmoids, Android calls them Widgets, in Cinnamon they’re called “Desklets”. The same way you can add applets to your panel, you can add desklets to your desktop.
In Cinnamon 1.8 you can install “spices” (i.e. applets, desklets, themes, extensions) straight from your desktop.
New features for developers
Settings API for Applets/Desklets
If you’re an Applet/Desklet developer, don’t use gsettings anymore. Cinnamon 1.8 features a settings API which will do all the work for you.
It will set up your settings and default values for you, automatically.
It will allow you to access your settings just as easily as you access values in an array.
It will generate a configuration screen for you, automatically.
Install Install Cinnamon 1.8 on Debian 7
Open the terminal and run the following commands
$ su --
Edit the /etc/apt/sources.list file
Add the following line
deb http://packages.linuxmint.com/ debian main import
Save and exit the file
Now import the GPG key
# gpg --keyserver pgp.mit.edu --recv-keys 3EE67F3D0FF405B2
# gpg --keyserver subkeys.pgp.net --recv-keys 3EE67F3D0FF405B2
# gpg --export 3EE67F3D0FF405B2 > 3EE67F3D0FF405B2.gpg
# apt-key add ./3EE67F3D0FF405B2.gpg
# apt-get update
# apt-get install cinnamon
Thanks to alex for key import steps