If you already downloaded Linux Mint 12, I inform you that the own Clement lefebvre shows us how to perform certain Tips to modify the experience of MGSE y MATE. Let's see what they are.
MGSE
Switch to a single panel at the top.
As many users may have seen, MGSE by default it gives us 2 panels (similar to Gnome2) but if we want, we can only use a panel on the back more in the style of Gnome Shell.
First, we disable the bottom panel:
- In the menu, we execute the tool «Advanced Preferences».
- select "Shell Extensions" or "Shell Extensions".
- We seek »Bottom panel extension» (Bottom Panel Extension) and we disable it.
Then we reboot Gnome Shell:
- We push "Alt F2".
- We wrote «R» And we pressed Enter.
Use the panel, menu and list of dark colored windows.
Now Linux Mint 12 we have two themes for gnome-shell: Mint-Z y Mint-Z-Black. The latter is the one that came by default in Lisa's RC. By default, it is now activated Mint-Z which has gray or silver tones (depending on the eye you see it with) 
To switch between them or choose other themes:
- Let's go to the tool «Advanced Settings» on the menu.
- Click on «Themes» (Theme).
- We change the value of "Shell Theme" for the subject that we want.
Quick view of files.
Linux Mint 12 includes an application called "Sushi", which is nothing more than a file viewer for Nautilus, which supports Images, Music, Video, Documents, PDF… etc. If I'm not mistaken it must be something like Globebus Preview, since to use it, we place ourselves on the file and press the «Space Bar»To view it.
HERB TEA.
Install MATE from the CD version.
To use MATE we simply have to install the package "Mint-meta-mate".
Solution when MATE panel disappears.
There are still some themes gtk that are incompatible with MATE. If this happens consider using two themes that work perfectly:
- Mint-Z-Matte
- Carbon
Mate consumes 100% of the CPU.
It is for the same reason that the panels disappear, because some Gtk themes are not supported, once again, consider using these two:
- Mint-Z-Matte
- Carbon