The idea itself isn't meant for a mobile environment. The GUI moves when you drag the windows around. This sort of interaction doesn't really play nice with mobile usage.
Slight pipedream aside; a tiling window manager with multiple real and virtual desktops plus gesture control would be nice. Anon or authed zeroconf wireless networking and would allow one to place/dock a mobile device to the side of your desktop/tv/other mobile and drag/sync apps and/or items between the two. Anyone know of a system or so that could do the likes of that?