Every *nix window manager has this ability. I currently use 4 on my PC, with fluxbox.
The only thing about this guy is he will load a drawing into several of his 12 desktops and then go home with his computer on "hibernate" so they are still locked. Even if I can boot his computer, it takes quite a while to navigate through his active stuff and close out the drawing I need to work on and not screw up what he is doing.
His three monitors BTW are a 21" Dell CRT and two 19" flat panels. He had to disable half the lights in his office to overcome the glare.