For once, this is actually not going to be a rant about Gnome Shell. It actually runs decently on a touchscreen!
I recently got a Samsung Series 5 Ultrabook which has a touchscreen on it. After having trouble getting Windows 8 how I want it on this laptop, I installed Fedora w/ XFCE across the entire disk. I got motivated to try again with Windows 8, though, because it's a shame having a touchscreen and no software that knows how to use it properly.
XFCE doesn't work well with a touchscreen. I can't move windows around on it by touching and dragging their title bars. I can't highlight text.. when I touch and drag over text, it selects it, but it immediately de-selects as soon as I let go. About the only thing I can do on XFCE is click on things, and scroll a window by touching and dragging the scroll bar.
Before dealing with repartitioning and getting Windows 8 back on there, I decided I'd
yum groupinstall "GNOME Desktop" and see how well Gnome Shell works with this touchscreen.
The first thing I tested was dragging windows around. It works. I opened Firefox and dragged inside a web page, which highlighted text (don't remember if the text stayed highlighted though). Dragging the scrollbar worked.
I opened Nautilus and navigated to /usr/share by touching the icons. This folder had a scrollbar. I could drag the scrollbar just like in Firefox, but I could also scroll the window by touching anywhere else in the window and swiping, just like you'd expect on Android or iOS. It supported acceleration too, where you could swipe quickly and let go and the window would continue scrolling and eventually slow down.
Dragging windows around in the Activities view worked exactly how you'd expect, too.
Gnome Shell doesn't support multi-touch, though. But I think this is the fault of X11 in general not supporting it, so you can't blame them for that. If you try a multi-touch gesture, it just gets confused and tries to treat all your fingers as one and you get erratic mouse movements or something.
I still don't like Gnome, but I am impressed that this actually works, for all the propaganda you hear from the Gnome devs about making it a tablet interface. I was expecting it to be as painful to use as XFCE on a touch screen.
Now, to install Windows 8 and then put Fedora XFCE back on.