Where and why are people running ubuntu on tablets?

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http://askubuntu.com – So I have been using Ubuntu since 2010. More and more, I am seeing people developing icons that would work well for tablets (Faenza and Faience). Also I am seeing the default Gnome Shell look more and more like it was designed for a tablet (large x buttons, as well as a bug where a virtual keyboard popped up on my laptop). My question is, if there is all this work going in to running Ubuntu and other linux distros on tablets, what tablets can it be run on? I've looked around on the web and have only seen it on android tablets through emulators as well as mockup images. Could one buy a Googl (HowTos)