Linux Mint 12 comes with a brand new desktop, built with Gnome 3 and MGSE.
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"MGSE" (Mint Gnome Shell Extensions) is a desktop layer on top of Gnome 3 that makes it possible for you to use Gnome 3 in a traditional way.
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You can disable all components within MGSE to get a pure Gnome 3 experience, or you can enable all of them to get a Gnome 3 desktop that is similar to what you’ve been using before.
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Of course you can also pick and only enable the components you like to design your own desktop.
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The main features in MGSE are:
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* The bottom panel
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* The application menu
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* The window list
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* A task-centric desktop (i.e. you switch between windows, not applications)