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Whether or not you like GNOME 3 and Ubuntu Unity, who could deny the real innovation that the developers behind those desktops have brought to bear? If you then take desktops such as Enlightenment (above) and Xfce, you can make a very strong case for more innovation going on with the Linux desktop than in any other area.
Image credit: Enlightenment
Ubuntu Christian Edition
The sheer variety of the Linux desktop is unmatched by any other platform. If you want something a little more traditional, go for KDE. If you want a more multitouch, friendly but original desktop, try either GNOME 3 or Ubuntu Unity. For something in between, you could opt for the attractive E17 or the lightweight and reliable Xfce.
Image credit: nightfox/Flickr