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Tablet interfaces are among the user-friendliest desktops available. They are simple, elegant, and don't get in the way of work. I believe — as do Ubuntu and GNOME — that this is the future of the PC desktop. For the most part, tablet applications are also designed with user-friendliness in mind. They are simple to use and there's very little clutter to the interface with no Ribbons to get in the way. So you might have more apps installed than you would on a laptop, but because of the ease of installation and removal, that's not a problem.
Pictured: the Toshiba Thrive Android tablet.
Photo credit: Erica Ogg/CNET News