This is not photoshopped. This is a screenshot of Compiz - or a compiz derivative, such as Beryl. Compiz is a 3D window manager for Linux. It does not replace the windowing system (xorg, X11, AIGLX, etc.), nor does it replace the desktop environment (KDE, Gnome).
I use Beryl on my Fedora Core partition. It's pretty neat, although I'm not sure if it's really practical.
Search youtube.com for "beryl" or "compiz" for some examples of this in action.