Now the ⊞ Win key takes you to the home screen, so ⊞ Win + Tab doesn't seem to work.
Does it exist in Windows 8?
How do I do it (just to satisfy my desire to see something 3D)?
Flip 3D does not seem to be part of the Windows 8.
I also had a look through the local policy and can not find anyway to enable/disable. Looks like it may be gone for good.
Hitting ⊞ Win + Tab now brings the new Switcher which shows all open apps down the left hand side of the screen.
There is a third-party version that does the same thing: WinFlip.
WinFlip is a 'Flip 3D' function for Windows XP It provides an alternate window-switcher to the standard Windows Alt-Tab. Winflip displays all open windows in a 3D stack, which the user can flick through and select using either keyboard or mouse.
Switcher is the replacement for Flip 3D:
The Aero code is being stripped out of Windows 8.