Aero Snap still works on the Windows 8 desktop. Just drag one application's window all the way to the left of the desktop and it will resize to occupy the left half of the screen. Drag another application all the way to the right and it will occupy the
right half of the screen.
If you're looking for something more in the line of Spaces on OS X or virtual desktops on Linux, have a look at VirtualWin. I'm pretty sure that still works on Windows 8.
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