Full-screen, transparent, toggle-able terminal for Ubuntu? (Like Quake/Visor)

I want to toggle a full-screen transparent terminal on some hotkey, so that when you close it, it just minimizes in the panel/tray but remains loaded in memory.

For example, Visor on Mac OS X:

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Use Guake

  • sudo apt-get install guake

  • F12 shows/hides

  • Use Preferences to adjust opacity, height, shortcuts and much more...

  • Guake on 12.04 Unity:

    enter image description here